Don't submit empty frames in android webview

android_webview/browser/surfaces_instance.h

 // Copyright 2016 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 ANDROID_WEBVIEW_BROWSER_SURFACES_INSTANCE_H_
 #define ANDROID_WEBVIEW_BROWSER_SURFACES_INSTANCE_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 72 matching lines @@
   std::unique_ptr<cc::Display> display_;
   std::unique_ptr<cc::LocalSurfaceIdAllocator> local_surface_id_allocator_;
   std::unique_ptr<cc::CompositorFrameSinkSupport> support_;
 
   cc::LocalSurfaceId root_id_;
   std::vector<cc::SurfaceId> child_ids_;
 
   // This is owned by |display_|.
   ParentOutputSurface* output_surface_;
 
+  gfx::Size surface_size_;
+
   DISALLOW_COPY_AND_ASSIGN(SurfacesInstance);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SURFACES_INSTANCE_H_