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

content/browser/gpu/gpu_data_manager_impl.h

Index: content/browser/gpu/gpu_data_manager_impl.h
diff --git a/content/browser/gpu/gpu_data_manager_impl.h b/content/browser/gpu/gpu_data_manager_impl.h
index c0ed419c4dfec33e20819262dada312efe5fb491..7104ed0d95190eacd2dbcd4d50dd6f100f436613 100644
--- a/content/browser/gpu/gpu_data_manager_impl.h
+++ b/content/browser/gpu/gpu_data_manager_impl.h
@@ -64,6 +64,12 @@ class CONTENT_EXPORT GpuDataManagerImpl
   // 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;