Revert "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 903c3b60766945d2ef4ded029df11d4c95d79cf8..1c4b0ccfc99cae5e854bbf197951d0aef7d0ddb2 100644
--- a/ui/compositor/test/test_compositor_host_ozone.cc
+++ b/ui/compositor/test/test_compositor_host_ozone.cc
@@ -27,6 +27,8 @@ class TestCompositorHostOzone : public TestCompositorHost {
   virtual void Show() OVERRIDE;
   virtual ui::Compositor* GetCompositor() OVERRIDE;
 
+  void Draw();
+
   gfx::Rect bounds_;
 
   ui::ContextFactory* context_factory_;
@@ -62,6 +64,11 @@ ui::Compositor* TestCompositorHostOzone::GetCompositor() {
   return compositor_.get();
 }
 
+void TestCompositorHostOzone::Draw() {
+  if (compositor_.get())
+    compositor_->Draw();
+}
+
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,