cc: Make OutputSurface::SwapBuffers pure virtual

cc/test/test_context_support.h

Index: cc/test/test_context_support.h
diff --git a/cc/test/test_context_support.h b/cc/test/test_context_support.h
index c9b0d147e1d27d1a0d710284efe6a5ae2d29ce08..ceadd93a8d543acad7b108ca8f810263b9cfe81a 100644
--- a/cc/test/test_context_support.h
+++ b/cc/test/test_context_support.h
@@ -48,25 +48,11 @@ class TestContextSupport : public gpu::ContextSupport {
   void SetScheduleOverlayPlaneCallback(
       const ScheduleOverlayPlaneCallback& schedule_overlay_plane_callback);
 
-  enum SwapType {
-    NO_SWAP,
-    SWAP,
-    PARTIAL_SWAP
-  };
-
-  SwapType last_swap_type() const { return last_swap_type_; }
-  gfx::Rect last_partial_swap_rect() const {
-    return last_partial_swap_rect_;
-  }
-
  private:
   std::vector<base::Closure> sync_point_callbacks_;
   SurfaceVisibleCallback set_visible_callback_;
   ScheduleOverlayPlaneCallback schedule_overlay_plane_callback_;
 
-  SwapType last_swap_type_;
-  gfx::Rect last_partial_swap_rect_;
-
   base::WeakPtrFactory<TestContextSupport> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TestContextSupport);