DevTools: Do not allow JS frames on top of non-JS invocation events.

Source/devtools/front_end/timeline/TimelineJSProfile.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 
 WebInspector.TimelineJSProfileProcessor = { };
 
 /**
  * @param {!ProfilerAgent.CPUProfile} jsProfile
  * @param {!WebInspector.TracingModel.Thread} thread
@@ skipping 64 matching lines @@
         case WebInspector.TimelineModel.RecordType.FunctionCall:
         case WebInspector.TimelineModel.RecordType.EvaluateScript:
             return true;
         }
         return false;
     }
 
     var jsFrameEvents = [];
     var jsFramesStack = [];
     var lockedJsStackDepth = [];
-    var invocationEventsDepth = 0;
     var currentSamplingIntervalMs = 0.1;
     var lastStackSampleTime = 0;
     var ordinal = 0;
 
     /**
      * @param {!WebInspector.TracingModel.Event} e
      */
     function updateSamplingInterval(e)
     {
         if (e.name !== WebInspector.TimelineModel.RecordType.JSSample)
@@ skipping 11 matching lines @@
 
     /**
      * @param {!WebInspector.TracingModel.Event} e
      */
     function onStartEvent(e)
     {
         e.ordinal = ++ordinal;
         extractStackTrace(e);
         // For the duration of the event we cannot go beyond the stack associated with it.
         lockedJsStackDepth.push(jsFramesStack.length);
-        if (isJSInvocationEvent(e))
-            ++invocationEventsDepth;
     }
 
     /**
      * @param {!WebInspector.TracingModel.Event} e
+     * @param {?WebInspector.TracingModel.Event} parent
      */
-    function onInstantEvent(e)
+    function onInstantEvent(e, parent)
     {
         e.ordinal = ++ordinal;
         updateSamplingInterval(e);
-        if (invocationEventsDepth)
+        if (parent && isJSInvocationEvent(parent))
             extractStackTrace(e);
     }
 
     /**
      * @param {!WebInspector.TracingModel.Event} e
      */
     function onEndEvent(e)
     {
-        if (isJSInvocationEvent(e))
-            --invocationEventsDepth;
         truncateJSStack(lockedJsStackDepth.pop(), e.endTime);
     }
 
     /**
      * @param {number} depth
      * @param {number} time
      */
     function truncateJSStack(depth, time)
     {
         if (lockedJsStackDepth.length) {
@@ skipping 240 matching lines @@
                 WebInspector.TracingModel.Phase.Instant, e.startTime, e.thread);
             sampleEvent.ordinal = e.ordinal;
             sampleEvent.args = {"data": {"stackTrace": stack }};
             samples.push(sampleEvent);
             break;
         }
     }
 
     return samples;
 }