Add LayerTreeHostSettings for synchronous compositor

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 b681e5def33c972ab0d4dc026ad28ad3bf359857..1a877f6eee90ac86ad7a8ccef752e2832fc8bab7 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -295,6 +295,16 @@ bool RenderWidget::AllowPartialSwap() const {
   return true;
 }
 
+bool RenderWidget::SynchronouslyDisableVSync() const {
+#if defined(OS_ANDROID)
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableSynchronousRendererCompositor)) {
+    return true;
+  }
+#endif
+  return false;
+}
+
 bool RenderWidget::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(RenderWidget, message)