Add kill switch mechanism

This code implements the kill switch mechanism in the extension. This is
explained in //src/killSwitch/README.md and in the design doc:
https://docs.google.com/document/d/1O5YV6_WcxwrUyz-lwHOSTfZ3oyIFWj2EQee0VuKkhaA/edit.

Bug: twpowertools:64

Change-Id: Ia993c78035bba7038aafd53d156f20954217e86f
diff --git a/src/third_party/google-protobuf-commonjs_strict/google/protobuf/compiler/plugin_pb.js b/src/third_party/google-protobuf-commonjs_strict/google/protobuf/compiler/plugin_pb.js
new file mode 100644
index 0000000..d080473
--- /dev/null
+++ b/src/third_party/google-protobuf-commonjs_strict/google/protobuf/compiler/plugin_pb.js
@@ -0,0 +1,1268 @@
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+/**
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+ * @enhanceable
+ * @suppress {missingRequire} reports error on implicit type usages.
+ * @suppress {messageConventions} JS Compiler reports an error if a variable or
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+ * @public
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+goog.exportSymbol('google.protobuf.compiler.CodeGeneratorResponse', null, proto);
+goog.exportSymbol('google.protobuf.compiler.CodeGeneratorResponse.Feature', null, proto);
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+ * If no data is provided, the constructed object will be empty, but still
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+ * @constructor
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+ * @param {Array=} opt_data Optional initial data array, typically from a
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+ * @param {Array=} opt_data Optional initial data array, typically from a
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+*/
+proto.google.protobuf.compiler.CodeGeneratorRequest.prototype.setCompilerVersion = function(value) {
+  return jspb.Message.setWrapperField(this, 3, value);
+};
+
+
+/**
+ * Clears the message field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorRequest} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorRequest.prototype.clearCompilerVersion = function() {
+  return this.setCompilerVersion(undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorRequest.prototype.hasCompilerVersion = function() {
+  return jspb.Message.getField(this, 3) != null;
+};
+
+
+
+/**
+ * List of repeated fields within this message type.
+ * @private {!Array<number>}
+ * @const
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.repeatedFields_ = [15];
+
+
+
+if (jspb.Message.GENERATE_TO_OBJECT) {
+/**
+ * Creates an object representation of this proto.
+ * Field names that are reserved in JavaScript and will be renamed to pb_name.
+ * Optional fields that are not set will be set to undefined.
+ * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
+ * For the list of reserved names please see:
+ *     net/proto2/compiler/js/internal/generator.cc#kKeyword.
+ * @param {boolean=} opt_includeInstance Deprecated. whether to include the
+ *     JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @return {!Object}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.toObject = function(opt_includeInstance) {
+  return proto.google.protobuf.compiler.CodeGeneratorResponse.toObject(opt_includeInstance, this);
+};
+
+
+/**
+ * Static version of the {@see toObject} method.
+ * @param {boolean|undefined} includeInstance Deprecated. Whether to include
+ *     the JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse} msg The msg instance to transform.
+ * @return {!Object}
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.toObject = function(includeInstance, msg) {
+  var f, obj = {
+    error: (f = jspb.Message.getField(msg, 1)) == null ? undefined : f,
+    supportedFeatures: (f = jspb.Message.getField(msg, 2)) == null ? undefined : f,
+    fileList: jspb.Message.toObjectList(msg.getFileList(),
+    proto.google.protobuf.compiler.CodeGeneratorResponse.File.toObject, includeInstance)
+  };
+
+  if (includeInstance) {
+    obj.$jspbMessageInstance = msg;
+  }
+  return obj;
+};
+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.deserializeBinary = function(bytes) {
+  var reader = new jspb.BinaryReader(bytes);
+  var msg = new proto.google.protobuf.compiler.CodeGeneratorResponse;
+  return proto.google.protobuf.compiler.CodeGeneratorResponse.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.deserializeBinaryFromReader = function(msg, reader) {
+  while (reader.nextField()) {
+    if (reader.isEndGroup()) {
+      break;
+    }
+    var field = reader.getFieldNumber();
+    switch (field) {
+    case 1:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setError(value);
+      break;
+    case 2:
+      var value = /** @type {number} */ (reader.readUint64());
+      msg.setSupportedFeatures(value);
+      break;
+    case 15:
+      var value = new proto.google.protobuf.compiler.CodeGeneratorResponse.File;
+      reader.readMessage(value,proto.google.protobuf.compiler.CodeGeneratorResponse.File.deserializeBinaryFromReader);
+      msg.addFile(value);
+      break;
+    default:
+      reader.skipField();
+      break;
+    }
+  }
+  return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.serializeBinary = function() {
+  var writer = new jspb.BinaryWriter();
+  proto.google.protobuf.compiler.CodeGeneratorResponse.serializeBinaryToWriter(this, writer);
+  return writer.getResultBuffer();
+};
+
+
+/**
+ * Serializes the given message to binary data (in protobuf wire
+ * format), writing to the given BinaryWriter.
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.serializeBinaryToWriter = function(message, writer) {
+  var f = undefined;
+  f = /** @type {string} */ (jspb.Message.getField(message, 1));
+  if (f != null) {
+    writer.writeString(
+      1,
+      f
+    );
+  }
+  f = /** @type {number} */ (jspb.Message.getField(message, 2));
+  if (f != null) {
+    writer.writeUint64(
+      2,
+      f
+    );
+  }
+  f = message.getFileList();
+  if (f.length > 0) {
+    writer.writeRepeatedMessage(
+      15,
+      f,
+      proto.google.protobuf.compiler.CodeGeneratorResponse.File.serializeBinaryToWriter
+    );
+  }
+};
+
+
+/**
+ * @enum {number}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.Feature = {
+  FEATURE_NONE: 0,
+  FEATURE_PROTO3_OPTIONAL: 1
+};
+
+
+
+
+if (jspb.Message.GENERATE_TO_OBJECT) {
+/**
+ * Creates an object representation of this proto.
+ * Field names that are reserved in JavaScript and will be renamed to pb_name.
+ * Optional fields that are not set will be set to undefined.
+ * To access a reserved field use, foo.pb_<name>, eg, foo.pb_default.
+ * For the list of reserved names please see:
+ *     net/proto2/compiler/js/internal/generator.cc#kKeyword.
+ * @param {boolean=} opt_includeInstance Deprecated. whether to include the
+ *     JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @return {!Object}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.toObject = function(opt_includeInstance) {
+  return proto.google.protobuf.compiler.CodeGeneratorResponse.File.toObject(opt_includeInstance, this);
+};
+
+
+/**
+ * Static version of the {@see toObject} method.
+ * @param {boolean|undefined} includeInstance Deprecated. Whether to include
+ *     the JSPB instance for transitional soy proto support:
+ *     http://goto/soy-param-migration
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} msg The msg instance to transform.
+ * @return {!Object}
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.toObject = function(includeInstance, msg) {
+  var f, obj = {
+    name: (f = jspb.Message.getField(msg, 1)) == null ? undefined : f,
+    insertionPoint: (f = jspb.Message.getField(msg, 2)) == null ? undefined : f,
+    content: (f = jspb.Message.getField(msg, 15)) == null ? undefined : f,
+    generatedCodeInfo: (f = msg.getGeneratedCodeInfo()) && google_protobuf_descriptor_pb.GeneratedCodeInfo.toObject(includeInstance, f)
+  };
+
+  if (includeInstance) {
+    obj.$jspbMessageInstance = msg;
+  }
+  return obj;
+};
+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.deserializeBinary = function(bytes) {
+  var reader = new jspb.BinaryReader(bytes);
+  var msg = new proto.google.protobuf.compiler.CodeGeneratorResponse.File;
+  return proto.google.protobuf.compiler.CodeGeneratorResponse.File.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.deserializeBinaryFromReader = function(msg, reader) {
+  while (reader.nextField()) {
+    if (reader.isEndGroup()) {
+      break;
+    }
+    var field = reader.getFieldNumber();
+    switch (field) {
+    case 1:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setName(value);
+      break;
+    case 2:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setInsertionPoint(value);
+      break;
+    case 15:
+      var value = /** @type {string} */ (reader.readString());
+      msg.setContent(value);
+      break;
+    case 16:
+      var value = new google_protobuf_descriptor_pb.GeneratedCodeInfo;
+      reader.readMessage(value,google_protobuf_descriptor_pb.GeneratedCodeInfo.deserializeBinaryFromReader);
+      msg.setGeneratedCodeInfo(value);
+      break;
+    default:
+      reader.skipField();
+      break;
+    }
+  }
+  return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.serializeBinary = function() {
+  var writer = new jspb.BinaryWriter();
+  proto.google.protobuf.compiler.CodeGeneratorResponse.File.serializeBinaryToWriter(this, writer);
+  return writer.getResultBuffer();
+};
+
+
+/**
+ * Serializes the given message to binary data (in protobuf wire
+ * format), writing to the given BinaryWriter.
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.serializeBinaryToWriter = function(message, writer) {
+  var f = undefined;
+  f = /** @type {string} */ (jspb.Message.getField(message, 1));
+  if (f != null) {
+    writer.writeString(
+      1,
+      f
+    );
+  }
+  f = /** @type {string} */ (jspb.Message.getField(message, 2));
+  if (f != null) {
+    writer.writeString(
+      2,
+      f
+    );
+  }
+  f = /** @type {string} */ (jspb.Message.getField(message, 15));
+  if (f != null) {
+    writer.writeString(
+      15,
+      f
+    );
+  }
+  f = message.getGeneratedCodeInfo();
+  if (f != null) {
+    writer.writeMessage(
+      16,
+      f,
+      google_protobuf_descriptor_pb.GeneratedCodeInfo.serializeBinaryToWriter
+    );
+  }
+};
+
+
+/**
+ * optional string name = 1;
+ * @return {string}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.getName = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.setName = function(value) {
+  return jspb.Message.setField(this, 1, value);
+};
+
+
+/**
+ * Clears the field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.clearName = function() {
+  return jspb.Message.setField(this, 1, undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.hasName = function() {
+  return jspb.Message.getField(this, 1) != null;
+};
+
+
+/**
+ * optional string insertion_point = 2;
+ * @return {string}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.getInsertionPoint = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 2, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.setInsertionPoint = function(value) {
+  return jspb.Message.setField(this, 2, value);
+};
+
+
+/**
+ * Clears the field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.clearInsertionPoint = function() {
+  return jspb.Message.setField(this, 2, undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.hasInsertionPoint = function() {
+  return jspb.Message.getField(this, 2) != null;
+};
+
+
+/**
+ * optional string content = 15;
+ * @return {string}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.getContent = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 15, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.setContent = function(value) {
+  return jspb.Message.setField(this, 15, value);
+};
+
+
+/**
+ * Clears the field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.clearContent = function() {
+  return jspb.Message.setField(this, 15, undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.hasContent = function() {
+  return jspb.Message.getField(this, 15) != null;
+};
+
+
+/**
+ * optional google.protobuf.GeneratedCodeInfo generated_code_info = 16;
+ * @return {?proto.google.protobuf.GeneratedCodeInfo}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.getGeneratedCodeInfo = function() {
+  return /** @type{?proto.google.protobuf.GeneratedCodeInfo} */ (
+    jspb.Message.getWrapperField(this, google_protobuf_descriptor_pb.GeneratedCodeInfo, 16));
+};
+
+
+/**
+ * @param {?proto.google.protobuf.GeneratedCodeInfo|undefined} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+*/
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.setGeneratedCodeInfo = function(value) {
+  return jspb.Message.setWrapperField(this, 16, value);
+};
+
+
+/**
+ * Clears the message field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.clearGeneratedCodeInfo = function() {
+  return this.setGeneratedCodeInfo(undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.File.prototype.hasGeneratedCodeInfo = function() {
+  return jspb.Message.getField(this, 16) != null;
+};
+
+
+/**
+ * optional string error = 1;
+ * @return {string}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.getError = function() {
+  return /** @type {string} */ (jspb.Message.getFieldWithDefault(this, 1, ""));
+};
+
+
+/**
+ * @param {string} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.setError = function(value) {
+  return jspb.Message.setField(this, 1, value);
+};
+
+
+/**
+ * Clears the field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.clearError = function() {
+  return jspb.Message.setField(this, 1, undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.hasError = function() {
+  return jspb.Message.getField(this, 1) != null;
+};
+
+
+/**
+ * optional uint64 supported_features = 2;
+ * @return {number}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.getSupportedFeatures = function() {
+  return /** @type {number} */ (jspb.Message.getFieldWithDefault(this, 2, 0));
+};
+
+
+/**
+ * @param {number} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.setSupportedFeatures = function(value) {
+  return jspb.Message.setField(this, 2, value);
+};
+
+
+/**
+ * Clears the field making it undefined.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.clearSupportedFeatures = function() {
+  return jspb.Message.setField(this, 2, undefined);
+};
+
+
+/**
+ * Returns whether this field is set.
+ * @return {boolean}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.hasSupportedFeatures = function() {
+  return jspb.Message.getField(this, 2) != null;
+};
+
+
+/**
+ * repeated File file = 15;
+ * @return {!Array<!proto.google.protobuf.compiler.CodeGeneratorResponse.File>}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.getFileList = function() {
+  return /** @type{!Array<!proto.google.protobuf.compiler.CodeGeneratorResponse.File>} */ (
+    jspb.Message.getRepeatedWrapperField(this, proto.google.protobuf.compiler.CodeGeneratorResponse.File, 15));
+};
+
+
+/**
+ * @param {!Array<!proto.google.protobuf.compiler.CodeGeneratorResponse.File>} value
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse} returns this
+*/
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.setFileList = function(value) {
+  return jspb.Message.setRepeatedWrapperField(this, 15, value);
+};
+
+
+/**
+ * @param {!proto.google.protobuf.compiler.CodeGeneratorResponse.File=} opt_value
+ * @param {number=} opt_index
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse.File}
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.addFile = function(opt_value, opt_index) {
+  return jspb.Message.addToRepeatedWrapperField(this, 15, opt_value, proto.google.protobuf.compiler.CodeGeneratorResponse.File, opt_index);
+};
+
+
+/**
+ * Clears the list making it empty but non-null.
+ * @return {!proto.google.protobuf.compiler.CodeGeneratorResponse} returns this
+ */
+proto.google.protobuf.compiler.CodeGeneratorResponse.prototype.clearFileList = function() {
+  return this.setFileList([]);
+};
+
+
+goog.object.extend(exports, proto);