gpu: Don't call SetSwapInterval() for NullTransportSurface

content/common/gpu/null_transport_surface.h

 // Copyright (c) 2014 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 CONTENT_COMMON_GPU_NULL_TRANSPORT_SURFACE_H_
 #define CONTENT_COMMON_GPU_NULL_TRANSPORT_SURFACE_H_
 
 #include "base/basictypes.h"
 #include "content/common/gpu/image_transport_surface.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace content {
 
 // Used when the GPU process is not involved in frame transport, but frame
 // resources are exchanged between client and target directly (such as in
 // delegated rendering).
 class NullTransportSurface : public PassThroughImageTransportSurface {
  public:
   NullTransportSurface(GpuChannelManager* manager,
                        GpuCommandBufferStub* stub,
                        const gfx::GLSurfaceHandle& handle);
 
-  // gfx::GLSurface implementation.
+  // gfx::GLSurfaceAdapter implementation.
   virtual bool Initialize() override;
   virtual void Destroy() override;
   virtual bool SwapBuffers() override;
   virtual bool PostSubBuffer(int x, int y, int width, int height) override;
+  virtual bool OnMakeCurrent(gfx::GLContext* context) override;
 
  protected:
   virtual ~NullTransportSurface();
 
   virtual void SendVSyncUpdateIfAvailable() override;
 
  private:
   uint32 parent_client_id_;
 
   DISALLOW_COPY_AND_ASSIGN(NullTransportSurface);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_NULL_TRANSPORT_SURFACE_H_