sync compositor: Async scroll offset IPC

content/browser/android/synchronous_compositor_host.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_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_
 #define CONTENT_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 92 matching lines @@
   IPC::Sender* const sender_;
   const bool async_input_;
   const bool use_in_process_zero_copy_software_draw_;
 
   bool is_active_;
   size_t bytes_limit_;
   std::unique_ptr<SharedMemoryWithSize> software_draw_shm_;
 
   // Updated by both renderer and browser.
   gfx::ScrollOffset root_scroll_offset_;
-  bool root_scroll_offset_updated_by_browser_;
 
   // From renderer.
   uint32_t renderer_param_version_;
   bool need_animate_scroll_;
   uint32_t need_invalidate_count_;
   bool need_begin_frame_;
   uint32_t did_activate_pending_tree_count_;
 
   base::WeakPtrFactory<SynchronousCompositorHost> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_SYNCHRONOUS_COMPOSITOR_HOST_H_