DevTools: fix race conditions while recording film strips

Source/devtools/front_end/sdk/ResourceTreeModel.js

 /*
  * Copyright (C) 2011 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 35 matching lines @@
     this._agent = target.pageAgent();
     this._agent.enable();
 
     this._fetchResourceTree();
 
     target.registerPageDispatcher(new WebInspector.PageDispatcher(this));
 
     this._pendingConsoleMessages = {};
     this._securityOriginFrameCount = {};
     this._inspectedPageURL = "";
+    this._pendingReloadOptions = null;
+    this._reloadSuspensionCount = 0;
 }
 
 WebInspector.ResourceTreeModel.EventTypes = {
     FrameAdded: "FrameAdded",
     FrameNavigated: "FrameNavigated",
     FrameDetached: "FrameDetached",
     FrameResized: "FrameResized",
     MainFrameNavigated: "MainFrameNavigated",
     ResourceAdded: "ResourceAdded",
     WillLoadCachedResources: "WillLoadCachedResources",
@@ skipping 424 matching lines @@
      * @param {string} url
      * @param {!WebInspector.ResourceType} type
      * @param {string} mimeType
      * @return {!WebInspector.Resource}
      */
     _createResourceFromFramePayload: function(frame, url, type, mimeType)
     {
         return new WebInspector.Resource(this.target(), null, url, frame.url, frame.id, frame.loaderId, type, mimeType);
     },
 
+    suspendReload: function()
+    {
+        this._reloadSuspensionCount++;
+    },
+
+    resumeReload: function()
+    {
+        this._reloadSuspensionCount--;
+        console.assert(this._reloadSuspensionCount >= 0, "Unbalanced call to ResourceTreeModel.resumeReload()");
+        if (!this._reloadSuspensionCount && this._pendingReloadOptions)
+            this.reloadPage.apply(this, this._pendingReloadOptions);
+    },
+
     /**
      * @param {boolean=} ignoreCache
      * @param {string=} scriptToEvaluateOnLoad
      */
     reloadPage: function(ignoreCache, scriptToEvaluateOnLoad)
     {
+        if (this._reloadSuspensionCount) {
+            this._pendingReloadOptions = [ignoreCache, scriptToEvaluateOnLoad];
+            return;
+        }
+        this._pendingReloadOptions = null;
         this.dispatchEventToListeners(WebInspector.ResourceTreeModel.EventTypes.WillReloadPage);
         this._agent.reload(ignoreCache, scriptToEvaluateOnLoad);
     },
 
     __proto__: WebInspector.SDKModel.prototype
 }
 
 /**
  * @constructor
  * @param {!WebInspector.ResourceTreeModel} model
@@ skipping 399 matching lines @@
     },
 
     /**
      * @override
      */
     interstitialHidden: function()
     {
         // Frontend is not interested in interstitials.
     }
 }