Fixing race conditions in ui::content::WindowSlider which could cause the overscroll overlay to nev…

content/browser/web_contents/aura/overscroll_navigation_overlay.h

 // 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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_AURA_OVERSCROLL_NAVIGATION_OVERLAY_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_AURA_OVERSCROLL_NAVIGATION_OVERLAY_H_
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "content/browser/web_contents/aura/window_slider.h"
@@ skipping 63 matching lines @@
   void StopObservingIfDone();
 
   // Creates a layer to be used for window-slide. |offset| is the offset of the
   // NavigationEntry for the screenshot image to display.
   ui::Layer* CreateSlideLayer(int offset);
 
   // IPC message callbacks.
   void OnUpdateRect(const ViewHostMsg_UpdateRect_Params& params);
 
   // Overridden from WindowSlider::Delegate:
-  virtual ui::Layer* CreateBackLayer() OVERRIDE;
-  virtual ui::Layer* CreateFrontLayer() OVERRIDE;
-  virtual void OnWindowSlideComplete() OVERRIDE;
+  virtual ui::Layer* OnSlideBackStartedCreateLayer() OVERRIDE;
+  virtual ui::Layer* OnSlideForwardStartedCreateLayer() OVERRIDE;
+  virtual void OnWindowFlingStarted() OVERRIDE;
+  virtual void OnWindowFlingCompleted() OVERRIDE;
   virtual void OnWindowSlideAborted() OVERRIDE;
   virtual void OnWindowSliderDestroyed() OVERRIDE;
 
   // Overridden from WebContentsObserver:
   virtual void DocumentOnLoadCompletedInMainFrame(int32 page_id) OVERRIDE;
   virtual void DidFirstVisuallyNonEmptyPaint(int32 page_id) OVERRIDE;
   virtual void DidStopLoading(RenderViewHost* host) OVERRIDE;
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // The WebContents which is being navigated.
@@ skipping 28 matching lines @@
   // container keeps waiting for a paint update it never receives, causing a
   // timeout. So during tests, disable the wait for paint updates.
   bool need_paint_update_;
 
   DISALLOW_COPY_AND_ASSIGN(OverscrollNavigationOverlay);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_AURA_OVERSCROLL_NAVIGATION_OVERLAY_H_