Disable rendering when suspending on chrome os

ui/compositor/compositor.cc

Index: ui/compositor/compositor.cc
diff --git a/ui/compositor/compositor.cc b/ui/compositor/compositor.cc
index ea04b8cd397026a070b96534420accbf8784b45b..5f2a43bba0f68316d9b4c10c294454c9a0bc1f30 100644
--- a/ui/compositor/compositor.cc
+++ b/ui/compositor/compositor.cc
@@ -224,6 +224,10 @@ void Compositor::ScheduleRedrawRect(const gfx::Rect& damage_rect) {
   host_->SetNeedsCommit();
 }
 
+void Compositor::FinishAllRendering() {
+  host_->FinishAllRendering();
+}
+
 void Compositor::DisableSwapUntilResize() {
   host_->FinishAllRendering();
   context_factory_->ResizeDisplay(this, gfx::Size());
@@ -260,6 +264,10 @@ void Compositor::SetVisible(bool visible) {
   host_->SetVisible(visible);
 }
 
+bool Compositor::IsVisible() {
+  return host_->visible();
+}
+
 scoped_refptr<CompositorVSyncManager> Compositor::vsync_manager() const {
   return vsync_manager_;
 }