sync compositor: Make OnComputeScroll async IPC

content/browser/android/synchronous_compositor_host.cc

Index: content/browser/android/synchronous_compositor_host.cc
diff --git a/content/browser/android/synchronous_compositor_host.cc b/content/browser/android/synchronous_compositor_host.cc
index 83dd85fead4cd30b82d7eb381f92b5dd8a799f36..c4292ecd18348e36767b2ffacbfed62a9d171f4a 100644
--- a/content/browser/android/synchronous_compositor_host.cc
+++ b/content/browser/android/synchronous_compositor_host.cc
@@ -278,12 +278,8 @@ void SynchronousCompositorHost::OnComputeScroll(
   SyncCompositorCommonBrowserParams common_browser_params;
   PopulateCommonParams(&common_browser_params);
   SyncCompositorCommonRendererParams common_renderer_params;
-  if (!sender_->Send(new SyncCompositorMsg_ComputeScroll(
-          routing_id_, common_browser_params, animation_time,
-          &common_renderer_params))) {
-    return;
-  }
-  ProcessCommonParams(common_renderer_params);
+  sender_->Send(new SyncCompositorMsg_ComputeScroll(
+      routing_id_, common_browser_params, animation_time));
 }
 
 InputEventAckState SynchronousCompositorHost::HandleInputEvent(