Resolves layering violation in SynchronousCompositorHost creation

content/browser/renderer_host/render_widget_host_view_android.cc

Index: content/browser/renderer_host/render_widget_host_view_android.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_android.cc b/content/browser/renderer_host/render_widget_host_view_android.cc
index 78c0d2271379a3629f84f3621665b921121d1daf..37c3ebad33211b6c3d81d56a5ad846884fdce050 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -450,6 +450,7 @@ RenderWidgetHostViewAndroid::RenderWidgetHostViewAndroid(
                         this),
       stylus_text_selector_(this),
       using_browser_compositor_(CompositorImpl::IsInitialized()),
+      synchronous_compositor_client_(nullptr),
       frame_evictor_(new DelegatedFrameEvictor(this)),
       locks_on_frame_count_(0),
       observing_root_window_(false),
@@ -1205,6 +1206,14 @@ void RenderWidgetHostViewAndroid::SynchronousFrameMetadata(
   }
 }
 
+void RenderWidgetHostViewAndroid::SetSynchronousCompositorClient(
+      SynchronousCompositorClient* client) {
+  synchronous_compositor_client_ = client;
+  if (!sync_compositor_) {

[boliu, 2016/11/10 21:24:33]

|| !synchronous_compositor_client_

too maybe? just to make it easier to read

[Jinsuk Kim, 2016/11/10 21:33:34]

Done.

+    sync_compositor_ = SynchronousCompositorHost::Create(this);
+  }
+}
+
 bool RenderWidgetHostViewAndroid::SupportsAnimation() const {
   // The synchronous (WebView) compositor does not have a proper browser
   // compositor with which to drive animations.
@@ -1788,11 +1797,6 @@ void RenderWidgetHostViewAndroid::SetContentViewCore(
     overscroll_controller_ = CreateOverscrollController(
         content_view_core_, ui::GetScaleFactorForNativeView(GetNativeView()));
   }
-
-  if (!sync_compositor_) {
-    sync_compositor_ = SynchronousCompositorHost::Create(
-        this, content_view_core_->GetWebContents());
-  }
 }
 
 void RenderWidgetHostViewAndroid::RunAckCallbacks() {