cc: Make OutputSurface::SwapBuffers pure virtual

cc/test/fake_output_surface.cc

 // Copyright 2012 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.
 
 #include "cc/test/fake_output_surface.h"
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/output_surface_client.h"
@@ skipping 55 matching lines @@
     frame->AssignTo(&last_sent_frame_);
 
     if (last_sent_frame_.delegated_frame_data) {
       resources_held_by_parent_.insert(
           resources_held_by_parent_.end(),
           last_sent_frame_.delegated_frame_data->resource_list.begin(),
           last_sent_frame_.delegated_frame_data->resource_list.end());
     }
 
     ++num_sent_frames_;
-    PostSwapBuffersComplete();
-    client_->DidSwapBuffers();
   } else {
-    OutputSurface::SwapBuffers(frame);
+    last_swap_rect_ = frame->gl_frame_data->sub_buffer_rect;
     frame->AssignTo(&last_sent_frame_);
     ++num_sent_frames_;
   }
+  PostSwapBuffersComplete();
+  client_->DidSwapBuffers();
 }
 
 void FakeOutputSurface::SetNeedsBeginFrame(bool enable) {
   needs_begin_frame_ = enable;
   OutputSurface::SetNeedsBeginFrame(enable);
 
   if (enable) {
     base::MessageLoop::current()->PostDelayedTask(
         FROM_HERE,
         base::Bind(&FakeOutputSurface::OnBeginFrame,
@@ skipping 42 matching lines @@
 bool FakeOutputSurface::HasExternalStencilTest() const {
   return has_external_stencil_test_;
 }
 
 void FakeOutputSurface::SetMemoryPolicyToSetAtBind(
     scoped_ptr<ManagedMemoryPolicy> memory_policy_to_set_at_bind) {
   memory_policy_to_set_at_bind_.swap(memory_policy_to_set_at_bind);
 }
 
 }  // namespace cc