Changed Blimp client to start with white screen before drawing contents

cc/trees/remote_channel_impl.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 CC_TREES_REMOTE_CHANNEL_IMPL_H_
 #define CC_TREES_REMOTE_CHANNEL_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 169 matching lines @@
       bool success,
       const RendererCapabilities& capabilities) override;
   void DidCompletePageScaleAnimation() override;
   void BeginMainFrame(std::unique_ptr<BeginMainFrameAndCommitState>
                           begin_main_frame_state) override;
 
   void SendMessageProto(std::unique_ptr<proto::CompositorMessage> proto);
 
   // called on main thread.
   void HandleProto(const proto::CompositorMessageToImpl& proto);
+  void DidCompleteSwapBuffersOnMain();
   void DidLoseOutputSurfaceOnMain();
   void RequestNewOutputSurfaceOnMain();
   void DidInitializeOutputSurfaceOnMain(
       bool success,
       const RendererCapabilities& capabilities);
   void SendMessageProtoOnMain(std::unique_ptr<proto::CompositorMessage> proto);
   void PostSetNeedsRedrawToImpl(const gfx::Rect& damaged_rect);
 
   void InitializeImplOnImpl(CompletionEvent* completion,
                             LayerTreeHost* layer_tree_host);
@@ skipping 14 matching lines @@
   CompositorThreadOnly compositor_thread_vars_unsafe_;
 
   base::WeakPtr<ProxyImpl> proxy_impl_weak_ptr_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteChannelImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_REMOTE_CHANNEL_IMPL_H_