cc: Make OutputSurface::SwapBuffers pure virtual

ui/compositor/test/in_process_context_factory.cc

Index: ui/compositor/test/in_process_context_factory.cc
diff --git a/ui/compositor/test/in_process_context_factory.cc b/ui/compositor/test/in_process_context_factory.cc
index fa2380fc242a7f9c2e188ecc5a4e0137358c9f70..24b0409866f829cc80d067efb5148dc05bc2d81c 100644
--- a/ui/compositor/test/in_process_context_factory.cc
+++ b/ui/compositor/test/in_process_context_factory.cc
@@ -6,7 +6,7 @@
 
 #include "base/command_line.h"
 #include "base/threading/thread.h"
-#include "cc/output/output_surface.h"
+#include "cc/test/pixel_test_output_surface.h"
 #include "cc/test/test_shared_bitmap_manager.h"
 #include "ui/compositor/compositor_switches.h"
 #include "ui/compositor/reflector.h"
@@ -59,7 +59,7 @@ scoped_ptr<cc::OutputSurface> InProcessContextFactory::CreateOutputSurface(
   scoped_refptr<ContextProviderInProcess> context_provider =
       ContextProviderInProcess::Create(context3d.Pass(), "UICompositor");
 
-  return make_scoped_ptr(new cc::OutputSurface(context_provider));
+  return make_scoped_ptr(new cc::PixelTestOutputSurface(context_provider));
 }
 
 scoped_refptr<Reflector> InProcessContextFactory::CreateReflector(