Rewire Android WebView's compositor changed signal.

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 47f8f8db5280b30ee0bea3bddf19f69c99830ccc..fd826657937de1956aba7ae8950e597a01459e52 100644
--- a/content/browser/renderer_host/render_widget_host_view_android.cc
+++ b/content/browser/renderer_host/render_widget_host_view_android.cc
@@ -1140,11 +1140,6 @@ void RenderWidgetHostViewAndroid::RetainFrame(
       new LastFrameInfo(output_surface_id, std::move(frame)));
 }
 
-SynchronousCompositorHost*
-RenderWidgetHostViewAndroid::GetSynchronousCompositor() {
-  return sync_compositor_.get();
-}
-
 void RenderWidgetHostViewAndroid::SynchronousFrameMetadata(
     const cc::CompositorFrameMetadata& frame_metadata) {
   if (!content_view_core_)
@@ -1794,8 +1789,6 @@ void RenderWidgetHostViewAndroid::SetContentViewCore(
     sync_compositor_ = SynchronousCompositorHost::Create(
         this, content_view_core_->GetWebContents());
   }
-  if (sync_compositor_)
-    sync_compositor_->DidBecomeCurrent();
 }
 
 void RenderWidgetHostViewAndroid::RunAckCallbacks(