Ensure a compositing window is created if the image transport surface isn't used.

content/browser/gpu/gpu_data_manager_impl.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_GPU_GPU_DATA_MANAGER_IMPL_H_
 #define CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 46 matching lines @@
   // kDisableCoreAnimationPlugins.
   void AppendPluginCommandLine(CommandLine* command_line);
 
   // This gets called when switching GPU might have happened.
   void HandleGpuSwitch();
 
   // Force the current card to be blacklisted (usually due to GPU process
   // crashes).
   void BlacklistCard();
 
+#if defined(OS_WIN)
+  // Is the GPU process using the accelerated surface to present, instead of
+  // presenting by itself.
+  bool IsUsingAcceleratedSurface();
+#endif
+
  private:
   typedef ObserverListThreadSafe<content::GpuDataManagerObserver>
       GpuDataManagerObserverList;
 
   friend struct DefaultSingletonTraits<GpuDataManagerImpl>;
 
   GpuDataManagerImpl();
   virtual ~GpuDataManagerImpl();
 
   void Initialize();
@@ skipping 29 matching lines @@
   FilePath swiftshader_path_;
 
   // Current card force-blacklisted due to GPU crashes, or disabled through
   // the --disable-gpu commandline switch.
   bool card_blacklisted_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuDataManagerImpl);
 };
 
 #endif  // CONTENT_BROWSER_GPU_GPU_DATA_MANAGER_IMPL_H_