Prevent browser thumbnailer from trying to read from frontbuffer (surface texture) when none exists.

content/browser/renderer_host/test_render_view_host.h

 // Copyright (c) 2012 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_RENDERER_HOST_TEST_RENDER_VIEW_HOST_H_
 #define CONTENT_BROWSER_RENDERER_HOST_TEST_RENDER_VIEW_HOST_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/gtest_prod_util.h"
@@ skipping 39 matching lines @@
 
   // RenderWidgetHostView implementation.
   virtual void InitAsChild(gfx::NativeView parent_view) OVERRIDE {}
   virtual RenderWidgetHost* GetRenderWidgetHost() const OVERRIDE;
   virtual void SetSize(const gfx::Size& size) OVERRIDE {}
   virtual void SetBounds(const gfx::Rect& rect) OVERRIDE {}
   virtual gfx::NativeView GetNativeView() const OVERRIDE;
   virtual gfx::NativeViewId GetNativeViewId() const OVERRIDE;
   virtual gfx::NativeViewAccessible GetNativeViewAccessible() OVERRIDE;
   virtual bool HasFocus() const OVERRIDE;
+  virtual bool IsSurfaceAvailableForCopy() const OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual bool IsShowing() OVERRIDE;
   virtual gfx::Rect GetViewBounds() const OVERRIDE;
 #if defined(OS_MACOSX)
   virtual void SetActive(bool active) OVERRIDE;
   virtual void SetTakesFocusOnlyOnMouseDown(bool flag) OVERRIDE {}
   virtual void SetWindowVisibility(bool visible) OVERRIDE {}
   virtual void WindowFrameChanged() OVERRIDE {}
 #endif  // defined(OS_MACOSX)
@@ skipping 246 matching lines @@
   TestRenderViewHost* active_test_rvh();
   TestWebContents* contents();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderViewHostImplTestHarness);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_TEST_RENDER_VIEW_HOST_H_