Revert of Make SingleThreadProxy a SchedulerClient

ui/compositor/test/test_compositor_host_x11.cc

Index: ui/compositor/test/test_compositor_host_x11.cc
diff --git a/ui/compositor/test/test_compositor_host_x11.cc b/ui/compositor/test/test_compositor_host_x11.cc
index cb620459af73d94a71a5be4ca856133b74c543cb..4b940cbd2d7f5de9bebb8b09f71ffb072af052c7 100644
--- a/ui/compositor/test/test_compositor_host_x11.cc
+++ b/ui/compositor/test/test_compositor_host_x11.cc
@@ -29,6 +29,8 @@
   // Overridden from TestCompositorHost:
   virtual void Show() OVERRIDE;
   virtual ui::Compositor* GetCompositor() OVERRIDE;
+
+  void Draw();
 
   gfx::Rect bounds_;
 
@@ -81,6 +83,11 @@
   return compositor_.get();
 }
 
+void TestCompositorHostX11::Draw() {
+  if (compositor_.get())
+    compositor_->Draw();
+}
+
 // static
 TestCompositorHost* TestCompositorHost::Create(
     const gfx::Rect& bounds,