DevTools: loading timeline pretends it is recording w/ 0 events collected.

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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.
@@ skipping 463 matching lines @@
      * @return {?WebInspector.ProgressIndicator}
      */
     _prepareToLoadTimeline: function()
     {
         if (this._operationInProgress)
             return null;
         if (this._recordingInProgress()) {
             this._updateToggleTimelineButton(false);
             this._stopRecording();
         }
+
+        /**
+         * @this {!WebInspector.TimelinePanel}
+         */
+        function finishLoading()
+        {
+            this._setOperationInProgress(null);
+            this._updateToggleTimelineButton(false);
+            this._hideProgressPane();
+        }
         var progressIndicator = new WebInspector.ProgressIndicator();
-        progressIndicator.addEventListener(WebInspector.Progress.Events.Done, this._setOperationInProgress.bind(this, null));
+        progressIndicator.addEventListener(WebInspector.Progress.Events.Done, finishLoading.bind(this));
         this._setOperationInProgress(progressIndicator);
         return progressIndicator;
     },
 
     /**
      * @param {?WebInspector.ProgressIndicator} indicator
      */
     _setOperationInProgress: function(indicator)
     {
         this._operationInProgress = !!indicator;
@@ skipping 243 matching lines @@
         if (this._lazyFrameModel)
             this._lazyFrameModel.reset();
         for (var i = 0; i < this._currentViews.length; ++i)
             this._currentViews[i].reset();
         for (var i = 0; i < this._overviewControls.length; ++i)
             this._overviewControls[i].reset();
         this._selection = null;
         this._updateSelectionDetails();
     },
 
-    _onRecordingStarted: function()
+    /**
+     * @param {!WebInspector.Event} event
+     */
+    _onRecordingStarted: function(event)
     {
         this._updateToggleTimelineButton(true);
-        this._updateProgress(WebInspector.UIString("%d events collected", 0));
+        if (event.data && event.data.fromFile)
+            this._updateProgress(WebInspector.UIString("Loading from file..."));
+        else
+            this._updateProgress(WebInspector.UIString("%d events collected", 0));
     },
 
     _recordingInProgress: function()
     {
         return this.toggleTimelineButton.toggled;
     },
 
     /**
      * @param {!WebInspector.Event} event
      */
@@ skipping 753 matching lines @@
 
 WebInspector.TimelinePanelFactory.prototype = {
     /**
      * @return {!WebInspector.Panel}
      */
     createPanel: function()
     {
         return WebInspector.TimelinePanel._instance();
     }
 }