sync compositor: Reduce begin frame sync IPC overhead

content/renderer/android/synchronous_compositor_proxy.h

 // Copyright 2015 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_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_
 #define CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 48 matching lines @@
 
   // SynchronousCompositorOutputSurfaceClient overrides.
   void DidActivatePendingTree() override;
   void Invalidate() override;
   void SwapBuffers(uint32_t output_surface_id,
                    cc::CompositorFrame frame) override;
 
   void SetOutputSurface(SynchronousCompositorOutputSurface* output_surface);
   void OnMessageReceived(const IPC::Message& message);
   bool Send(IPC::Message* message);
+  void PopulateCommonParams(SyncCompositorCommonRendererParams* params) const;
 
  private:
   struct SharedMemoryWithSize;
 
   // IPC handlers.
-  void PopulateCommonParams(SyncCompositorCommonRendererParams* params) const;
   void OnComputeScroll(base::TimeTicks animation_time);
   void DemandDrawHw(const SyncCompositorDemandDrawHwParams& params,
                     IPC::Message* reply_message);
   void SetSharedMemory(
       const SyncCompositorSetSharedMemoryParams& params,
       bool* success,
       SyncCompositorCommonRendererParams* common_renderer_params);
   void ZeroSharedMemory();
   void DemandDrawSw(const SyncCompositorDemandDrawSwParams& params,
                     IPC::Message* reply_message);
@@ skipping 37 matching lines @@
   bool need_animate_scroll_;
   uint32_t need_invalidate_count_;
   uint32_t did_activate_pending_tree_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorProxy);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_ANDROID_SYNCHRONOUS_COMPOSITOR_PROXY_H_