sync compositor: Make OnComputeScroll async IPC

content/renderer/android/synchronous_compositor_proxy.cc

 // 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.
 
 #include "content/renderer/android/synchronous_compositor_proxy.h"
 
 #include "base/auto_reset.h"
 #include "base/memory/shared_memory.h"
 #include "content/common/android/sync_compositor_messages.h"
 #include "content/common/cc_messages.h"
@@ skipping 339 matching lines @@
   DCHECK(!(hardware_draw_reply_ && software_draw_reply_));
   if (hardware_draw_reply_) {
     SwapBuffersHw(frame);
   } else if (software_draw_reply_) {
     SwapBuffersSw(frame);
   }
 }
 
 void SynchronousCompositorProxy::OnComputeScroll(
     const SyncCompositorCommonBrowserParams& common_params,
-    base::TimeTicks animation_time,
-    SyncCompositorCommonRendererParams* common_renderer_params) {
-  DCHECK(!inside_receive_);
-  base::AutoReset<bool> scoped_inside_receive(&inside_receive_, true);
-
+    base::TimeTicks animation_time) {
   ProcessCommonParams(common_params);
   if (need_animate_scroll_) {
     need_animate_scroll_ = false;
     input_handler_proxy_->SynchronouslyAnimate(animation_time);
   }
-  PopulateCommonParams(common_renderer_params);
 }
 
 void SynchronousCompositorProxy::DidOverscroll(
     const DidOverscrollParams& did_overscroll_params) {
   SyncCompositorCommonRendererParams params;
   PopulateCommonParams(&params);
   Send(new SyncCompositorHostMsg_OverScroll(routing_id_, params,
                                             did_overscroll_params));
 }
 
@@ skipping 10 matching lines @@
         total_scroll_offset_);
   }
   begin_frame_source_->SetBeginFrameSourcePaused(
       common_params.begin_frame_source_paused);
   if (!common_params.ack.resources.empty()) {
     output_surface_->ReturnResources(common_params.ack);
   }
 }
 
 }  // namespace content