aura: Defer OutputSurface creation until widget is available

ui/compositor/test/test_compositor_host_win.cc

Index: ui/compositor/test/test_compositor_host_win.cc
diff --git a/ui/compositor/test/test_compositor_host_win.cc b/ui/compositor/test/test_compositor_host_win.cc
index c8450108ef53ac031927cad58f6a3576779958f0..b0e00706fb227501b24c98bcaf5acaf22a06f557 100644
--- a/ui/compositor/test/test_compositor_host_win.cc
+++ b/ui/compositor/test/test_compositor_host_win.cc
@@ -20,7 +20,7 @@ class TestCompositorHostWin : public TestCompositorHost,
     Init(NULL, bounds);
     compositor_.reset(new ui::Compositor(context_factory,
                                          base::ThreadTaskRunnerHandle::Get()));
-    compositor_->SetAcceleratedWidgetAndStartCompositor(hwnd());
+    compositor_->SetAcceleratedWidget(hwnd());
     compositor_->SetScaleAndSize(1.0f, GetSize());
   }