Revert of Make SingleThreadProxy a SchedulerClient

ui/compositor/test/test_compositor_host_ozone.cc

Index: ui/compositor/test/test_compositor_host_ozone.cc
diff --git a/ui/compositor/test/test_compositor_host_ozone.cc b/ui/compositor/test/test_compositor_host_ozone.cc
index 9af52369b96a08d8661a69ecab856b0bbebc56e4..1c7a8da9aca45026ed63ff0ac725e782b288430b 100644
--- a/ui/compositor/test/test_compositor_host_ozone.cc
+++ b/ui/compositor/test/test_compositor_host_ozone.cc
@@ -26,6 +26,8 @@
   // Overridden from TestCompositorHost:
   virtual void Show() OVERRIDE;
   virtual ui::Compositor* GetCompositor() OVERRIDE;
+
+  void Draw();
 
   gfx::Rect bounds_;
 
@@ -60,6 +62,11 @@
   return compositor_.get();
 }
 
+void TestCompositorHostOzone::Draw() {
+  if (compositor_.get())
+    compositor_->Draw();
+}
+
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,