[DevTools] Teach MediaQueryInspector about disabling models while profiling.

Source/devtools/front_end/sdk/CSSStyleModel.js

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 52 matching lines @@
     if (!matchArray)
         return [];
 
     var result = [];
     for (var i = 0; i < matchArray.length; ++i)
         result.push(WebInspector.CSSRule.parsePayload(cssModel, matchArray[i].rule, matchArray[i].matchingSelectors));
     return result;
 }
 
 WebInspector.CSSStyleModel.Events = {
+    ModelWasDisabled: "ModelWasDisabled",
     ModelWasEnabled: "ModelWasEnabled",
     StyleSheetAdded: "StyleSheetAdded",
     StyleSheetChanged: "StyleSheetChanged",
     StyleSheetRemoved: "StyleSheetRemoved",
     MediaQueryResultChanged: "MediaQueryResultChanged",
 }
 
 WebInspector.CSSStyleModel.MediaTypes = ["all", "braille", "embossed", "handheld", "print", "projection", "screen", "speech", "tty", "tv"];
 
 WebInspector.CSSStyleModel.prototype = {
     suspendModel: function()
     {
         this._agent.disable();
         this._isEnabled = false;
-        this._resetStyleSheets();
+        this.dispatchEventToListeners(WebInspector.CSSStyleModel.Events.ModelWasDisabled);
     },
 
     resumeModel: function()
     {
+        this._resetStyleSheets();

[lushnikov, 2015/02/25 15:23:55]

why this change?

[dgozman, 2015/02/25 15:51:55]

So we don't immediately clear UI because of disappeared stylesheets.

         this._agent.enable(this._wasEnabled.bind(this));
     },
 
     /**
      * @param {function(!Array.<!WebInspector.CSSMedia>)} userCallback
      */
     getMediaQueries: function(userCallback)
     {
         /**
          * @param {?Protocol.Error} error
@@ skipping 1718 matching lines @@
             // The loader has been reset.
             if (!callbacks)
                 return;
 
             delete this._nodeIdToCallbackData[nodeId];
             for (var i = 0; i < callbacks.length; ++i)
                 callbacks[i](computedStyle);
         }
     }
 }