Make Mac swap code like other platforms

gpu/ipc/service/gpu_channel_test_common.h

 // Copyright (c) 2015 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 <stdint.h>
 
 #include <memory>
 
 #include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/ipc/service/gpu_channel.h"
@@ skipping 27 matching lines @@
   void DidCreateOffscreenContext(const GURL& active_url) override;
   void DidDestroyChannel(int client_id) override;
   void DidDestroyOffscreenContext(const GURL& active_url) override;
   void DidLoseContext(bool offscreen,
                       error::ContextLostReason reason,
                       const GURL& active_url) override;
   void GpuMemoryUmaStats(const GPUMemoryUmaStats& params) override;
   void StoreShaderToDisk(int32_t client_id,
                          const std::string& key,
                          const std::string& shader) override;
-#if defined(OS_MACOSX)
-  void SendAcceleratedSurfaceBuffersSwapped(
-      gpu::SurfaceHandle surface_handle,
-      CAContextID ca_context_id,
-      bool fullscreen_low_power_ca_context_valid,
-      CAContextID fullscreen_low_power_ca_context_id,
-      const gfx::ScopedRefCountedIOSurfaceMachPort& io_surface,
-      const gfx::Size& size,
-      float scale_factor,
-      std::vector<ui::LatencyInfo> latency_info) override;
-#endif
 #if defined(OS_WIN)
   void SendAcceleratedSurfaceCreatedChildWindow(
       SurfaceHandle parent_window,
       SurfaceHandle child_window) override;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(TestGpuChannelManagerDelegate);
 };
 
 class TestGpuChannelManager : public GpuChannelManager {
@@ skipping 58 matching lines @@
  private:
   GpuPreferences gpu_preferences_;
   scoped_refptr<base::TestSimpleTaskRunner> task_runner_;
   scoped_refptr<base::TestSimpleTaskRunner> io_task_runner_;
   std::unique_ptr<SyncPointManager> sync_point_manager_;
   std::unique_ptr<TestGpuChannelManagerDelegate> channel_manager_delegate_;
   std::unique_ptr<GpuChannelManager> channel_manager_;
 };
 
 }  // namespace gpu