DevTools: make hitCount optional & experimental in Profiler domain.

third_party/WebKit/Source/devtools/front_end/sdk/HeapProfilerModel.js

 /**
  * @constructor
  * @extends {WebInspector.SDKModel}
  * @param {!WebInspector.Target} target
  */
 WebInspector.HeapProfilerModel = function(target)
 {
     WebInspector.SDKModel.call(this, WebInspector.HeapProfilerModel, target);
     target.registerHeapProfilerDispatcher(new WebInspector.HeapProfilerDispatcher(this));
     this._enabled = false;
@@ skipping 19 matching lines @@
         this._heapProfilerAgent.enable();
     },
 
     startSampling: function()
     {
         var defaultSamplingIntervalInBytes = 16384;
         this._heapProfilerAgent.startSampling(defaultSamplingIntervalInBytes);
     },
 
     /**
-     * @return {!Promise.<?ProfilerAgent.CPUProfile>}
+     * @return {!Promise.<?ProfilerAgent.Profile>}
      */
     stopSampling: function()
     {
         this._isRecording = false;
         var currentProfile = null;
         return this._heapProfilerAgent.stopSampling((error, profile) => { currentProfile = !error ? profile : null; })
             .then(() => currentProfile);
     },
 
     /**
@@ skipping 90 matching lines @@
     },
 
     /**
      * @override
      */
     resetProfiles: function()
     {
         this._heapProfilerModel.resetProfiles();
     }
 }