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/static/options/options.html b/src/static/options/options.html
index f22fb30..91a8205 100644
--- a/src/static/options/options.html
+++ b/src/static/options/options.html
@@ -39,6 +39,7 @@
         </a>
       </div>
       <form>
+        <div class="kill-switch-text" id="kill-switch-warning" hidden data-i18n="killswitchwarning"></div>
         <div class="option"><input type="checkbox" id="list"> <label for="list" data-i18n="list"></label></div>
         <div class="option"><input type="checkbox" id="thread"> <label for="thread" data-i18n="thread"></label></div>
         <div class="option"><input type="checkbox" id="threadall"> <label for="threadall" data-i18n="threadall"></label></div>