cc: Make OutputSurface::SwapBuffers pure virtual

cc/test/test_context_support.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_TEST_TEST_CONTEXT_SUPPORT_H_
 #define CC_TEST_TEST_CONTEXT_SUPPORT_H_
 
 #include <vector>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 30 matching lines @@
 
   typedef base::Callback<void(int plane_z_order,
                               gfx::OverlayTransform plane_transform,
                               unsigned overlay_texture_id,
                               const gfx::Rect& display_bounds,
                               const gfx::RectF& crop_rect)>
       ScheduleOverlayPlaneCallback;
   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);
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_CONTEXT_SUPPORT_H_