Deflake PrerenderExcessiveMemory, fix race

chrome/browser/prerender/prerender_contents.h

 // Copyright (c) 2011 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 CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "base/values.h"
 #include "chrome/browser/prerender/prerender_final_status.h"
 #include "content/browser/tab_contents/tab_contents_observer.h"
 #include "content/browser/renderer_host/render_view_host_delegate.h"
 #include "content/common/notification_registrar.h"
+#include "ui/gfx/rect.h"
 
 class Profile;
 class RenderViewHost;
 class TabContents;
 class TabContentsWrapper;
 struct FaviconURL;
 struct ViewHostMsg_FrameNavigate_Params;
 
 namespace base {
 class ProcessMetrics;
@@ skipping 243 matching lines @@
 
   // Page ID at which prerendering started.
   int32 starting_page_id_;
 
   // Origin for this prerender.
   Origin origin_;
 
   // Experiment during which this prerender is performed.
   uint8 experiment_id_;
 
-  // Offset by which to offset prerendered pages
+  // Offset by which to offset prerendered pages.
   static const int32 kPrerenderPageIdOffset = 10;
 
+  // Bounds to use for the prerendered TabContents.
+  gfx::Rect tab_bounds_;
+
   DISALLOW_COPY_AND_ASSIGN(PrerenderContents);
 };
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_CONTENTS_H_