renderer-mus: Plumb LocalSurfaceId into RenderWidgetCompositor

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 6be17703805bf314b827aec8378149cd83b9110a..76be34d54dee28e65460ae4ba2418696e89fe6ec 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1283,6 +1283,12 @@ blink::WebLayerTreeView* RenderWidget::initializeLayerTreeView() {
   OnDeviceScaleFactorChanged();
   compositor_->SetRasterColorSpace(screen_info_.icc_profile.GetColorSpace());
   compositor_->SetContentSourceId(current_content_source_id_);
+#if defined(USE_AURA)
+  RendererWindowTreeClient* window_tree_client =
+      RendererWindowTreeClient::Get(routing_id_);
+  if (window_tree_client)
+    compositor_->SetLocalSurfaceId(window_tree_client->local_surface_id());
+#endif
   // For background pages and certain tests, we don't want to trigger
   // CompositorFrameSink creation.
   if (compositor_never_visible_ || !RenderThreadImpl::current())