Changed Blimp client to start with white screen before drawing contents

blimp/client/feature/compositor/blimp_compositor_manager.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 BLIMP_CLIENT_FEATURE_COMPOSITOR_BLIMP_COMPOSITOR_MANAGER_H_
 #define BLIMP_CLIENT_FEATURE_COMPOSITOR_BLIMP_COMPOSITOR_MANAGER_H_
 
 #include "base/macros.h"
 #include "blimp/client/feature/compositor/blimp_compositor.h"
 #include "blimp/client/feature/compositor/blimp_gpu_memory_buffer_manager.h"
@@ skipping 43 matching lines @@
  private:
   // RenderWidgetFeatureDelegate implementation.
   void OnRenderWidgetCreated(int render_widget_id) override;
   void OnRenderWidgetInitialized(int render_widget_id) override;
   void OnRenderWidgetDeleted(int render_widget_id) override;
   void OnCompositorMessageReceived(
       int render_widget_id,
       std::unique_ptr<cc::proto::CompositorMessage> message) override;
 
   // BlimpCompositorClient implementation.
+  void DidCompleteSwapBuffers() override;
   cc::LayerTreeSettings* GetLayerTreeSettings() override;
   scoped_refptr<base::SingleThreadTaskRunner>
   GetCompositorTaskRunner() override;
   cc::TaskGraphRunner* GetTaskGraphRunner() override;
   gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() override;
   cc::ImageSerializationProcessor* GetImageSerializationProcessor() override;
   void SendWebGestureEvent(
       int render_widget_id,
       const blink::WebGestureEvent& gesture_event) override;
   void SendCompositorMessage(
@@ skipping 30 matching lines @@
   // BlimpCompositorManager instance.
   RenderWidgetFeature* render_widget_feature_;
 
   DISALLOW_COPY_AND_ASSIGN(BlimpCompositorManager);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_FEATURE_COMPOSITOR_BLIMP_COMPOSITOR_MANAGER_H_