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/struct_pb.js b/src/third_party/google-protobuf-commonjs_strict/google/protobuf/struct_pb.js
new file mode 100644
index 0000000..b1f2a9a
--- /dev/null
+++ b/src/third_party/google-protobuf-commonjs_strict/google/protobuf/struct_pb.js
@@ -0,0 +1,948 @@
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+}
+
+
+/**
+ * Deserializes binary data (in protobuf wire format).
+ * @param {jspb.ByteSource} bytes The bytes to deserialize.
+ * @return {!proto.google.protobuf.ListValue}
+ */
+proto.google.protobuf.ListValue.deserializeBinary = function(bytes) {
+  var reader = new jspb.BinaryReader(bytes);
+  var msg = new proto.google.protobuf.ListValue;
+  return proto.google.protobuf.ListValue.deserializeBinaryFromReader(msg, reader);
+};
+
+
+/**
+ * Deserializes binary data (in protobuf wire format) from the
+ * given reader into the given message object.
+ * @param {!proto.google.protobuf.ListValue} msg The message object to deserialize into.
+ * @param {!jspb.BinaryReader} reader The BinaryReader to use.
+ * @return {!proto.google.protobuf.ListValue}
+ */
+proto.google.protobuf.ListValue.deserializeBinaryFromReader = function(msg, reader) {
+  while (reader.nextField()) {
+    if (reader.isEndGroup()) {
+      break;
+    }
+    var field = reader.getFieldNumber();
+    switch (field) {
+    case 1:
+      var value = new proto.google.protobuf.Value;
+      reader.readMessage(value,proto.google.protobuf.Value.deserializeBinaryFromReader);
+      msg.addValues(value);
+      break;
+    default:
+      reader.skipField();
+      break;
+    }
+  }
+  return msg;
+};
+
+
+/**
+ * Serializes the message to binary data (in protobuf wire format).
+ * @return {!Uint8Array}
+ */
+proto.google.protobuf.ListValue.prototype.serializeBinary = function() {
+  var writer = new jspb.BinaryWriter();
+  proto.google.protobuf.ListValue.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.ListValue} message
+ * @param {!jspb.BinaryWriter} writer
+ * @suppress {unusedLocalVariables} f is only used for nested messages
+ */
+proto.google.protobuf.ListValue.serializeBinaryToWriter = function(message, writer) {
+  var f = undefined;
+  f = message.getValuesList();
+  if (f.length > 0) {
+    writer.writeRepeatedMessage(
+      1,
+      f,
+      proto.google.protobuf.Value.serializeBinaryToWriter
+    );
+  }
+};
+
+
+/**
+ * repeated Value values = 1;
+ * @return {!Array<!proto.google.protobuf.Value>}
+ */
+proto.google.protobuf.ListValue.prototype.getValuesList = function() {
+  return /** @type{!Array<!proto.google.protobuf.Value>} */ (
+    jspb.Message.getRepeatedWrapperField(this, proto.google.protobuf.Value, 1));
+};
+
+
+/**
+ * @param {!Array<!proto.google.protobuf.Value>} value
+ * @return {!proto.google.protobuf.ListValue} returns this
+*/
+proto.google.protobuf.ListValue.prototype.setValuesList = function(value) {
+  return jspb.Message.setRepeatedWrapperField(this, 1, value);
+};
+
+
+/**
+ * @param {!proto.google.protobuf.Value=} opt_value
+ * @param {number=} opt_index
+ * @return {!proto.google.protobuf.Value}
+ */
+proto.google.protobuf.ListValue.prototype.addValues = function(opt_value, opt_index) {
+  return jspb.Message.addToRepeatedWrapperField(this, 1, opt_value, proto.google.protobuf.Value, opt_index);
+};
+
+
+/**
+ * Clears the list making it empty but non-null.
+ * @return {!proto.google.protobuf.ListValue} returns this
+ */
+proto.google.protobuf.ListValue.prototype.clearValuesList = function() {
+  return this.setValuesList([]);
+};
+
+
+/**
+ * @enum {number}
+ */
+proto.google.protobuf.NullValue = {
+  NULL_VALUE: 0
+};
+
+goog.object.extend(exports, proto);
+/* This code will be inserted into generated code for
+ * google/protobuf/struct.proto. */
+
+/**
+ * Typedef representing plain JavaScript values that can go into a
+ *     Struct.
+ * @typedef {null|number|string|boolean|Array|Object}
+ */
+proto.google.protobuf.JavaScriptValue;
+
+
+/**
+ * Converts this Value object to a plain JavaScript value.
+ * @return {?proto.google.protobuf.JavaScriptValue} a plain JavaScript
+ *     value representing this Struct.
+ */
+proto.google.protobuf.Value.prototype.toJavaScript = function() {
+  var kindCase = proto.google.protobuf.Value.KindCase;
+  switch (this.getKindCase()) {
+    case kindCase.NULL_VALUE:
+      return null;
+    case kindCase.NUMBER_VALUE:
+      return this.getNumberValue();
+    case kindCase.STRING_VALUE:
+      return this.getStringValue();
+    case kindCase.BOOL_VALUE:
+      return this.getBoolValue();
+    case kindCase.STRUCT_VALUE:
+      return this.getStructValue().toJavaScript();
+    case kindCase.LIST_VALUE:
+      return this.getListValue().toJavaScript();
+    default:
+      throw new Error('Unexpected struct type');
+  }
+};
+
+
+/**
+ * Converts this JavaScript value to a new Value proto.
+ * @param {!proto.google.protobuf.JavaScriptValue} value The value to
+ *     convert.
+ * @return {!proto.google.protobuf.Value} The newly constructed value.
+ */
+proto.google.protobuf.Value.fromJavaScript = function(value) {
+  var ret = new proto.google.protobuf.Value();
+  switch (goog.typeOf(value)) {
+    case 'string':
+      ret.setStringValue(/** @type {string} */ (value));
+      break;
+    case 'number':
+      ret.setNumberValue(/** @type {number} */ (value));
+      break;
+    case 'boolean':
+      ret.setBoolValue(/** @type {boolean} */ (value));
+      break;
+    case 'null':
+      ret.setNullValue(proto.google.protobuf.NullValue.NULL_VALUE);
+      break;
+    case 'array':
+      ret.setListValue(proto.google.protobuf.ListValue.fromJavaScript(
+          /** @type{!Array} */ (value)));
+      break;
+    case 'object':
+      ret.setStructValue(proto.google.protobuf.Struct.fromJavaScript(
+          /** @type{!Object} */ (value)));
+      break;
+    default:
+      throw new Error('Unexpected struct type.');
+  }
+
+  return ret;
+};
+
+
+/**
+ * Converts this ListValue object to a plain JavaScript array.
+ * @return {!Array} a plain JavaScript array representing this List.
+ */
+proto.google.protobuf.ListValue.prototype.toJavaScript = function() {
+  var ret = [];
+  var values = this.getValuesList();
+
+  for (var i = 0; i < values.length; i++) {
+    ret[i] = values[i].toJavaScript();
+  }
+
+  return ret;
+};
+
+
+/**
+ * Constructs a ListValue protobuf from this plain JavaScript array.
+ * @param {!Array} array a plain JavaScript array
+ * @return {proto.google.protobuf.ListValue} a new ListValue object
+ */
+proto.google.protobuf.ListValue.fromJavaScript = function(array) {
+  var ret = new proto.google.protobuf.ListValue();
+
+  for (var i = 0; i < array.length; i++) {
+    ret.addValues(proto.google.protobuf.Value.fromJavaScript(array[i]));
+  }
+
+  return ret;
+};
+
+
+/**
+ * Converts this Struct object to a plain JavaScript object.
+ * @return {!Object<string, !proto.google.protobuf.JavaScriptValue>} a plain
+ *     JavaScript object representing this Struct.
+ */
+proto.google.protobuf.Struct.prototype.toJavaScript = function() {
+  var ret = {};
+
+  this.getFieldsMap().forEach(function(value, key) {
+    ret[key] = value.toJavaScript();
+  });
+
+  return ret;
+};
+
+
+/**
+ * Constructs a Struct protobuf from this plain JavaScript object.
+ * @param {!Object} obj a plain JavaScript object
+ * @return {proto.google.protobuf.Struct} a new Struct object
+ */
+proto.google.protobuf.Struct.fromJavaScript = function(obj) {
+  var ret = new proto.google.protobuf.Struct();
+  var map = ret.getFieldsMap();
+
+  for (var property in obj) {
+    var val = obj[property];
+    map.set(property, proto.google.protobuf.Value.fromJavaScript(val));
+  }
+
+  return ret;
+};