Fix content scaling bug on Mac

content/common/gpu/image_transport_surface_fbo_mac.h

 // Copyright 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_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/gpu/gpu_command_buffer_stub.h"
@@ skipping 70 matching lines @@
   // Called when the context may continue to make forward progress after a swap.
   void SendSwapBuffers(uint64 surface_handle,
                        const gfx::Size pixel_size,
                        float scale_factor);
   void SetRendererID(int renderer_id);
 
  protected:
   // ImageTransportSurface implementation
   void OnBufferPresented(
       const AcceleratedSurfaceMsg_BufferPresented_Params& params) override;
-  void OnResize(gfx::Size size, float scale_factor) override;
+  void OnResize(gfx::Size pixel_size, float scale_factor) override;
   void SetLatencyInfo(const std::vector<ui::LatencyInfo>&) override;
   void WakeUpGpu() override;
 
   // GpuCommandBufferStub::DestructionObserver implementation.
   void OnWillDestroyStub() override;
 
  private:
   ~ImageTransportSurfaceFBO() override;
 
   void AdjustBufferAllocation();
   void DestroyFramebuffer();
-  void CreateFramebuffer();
+  void AllocateOrResizeFramebuffer(
+      const gfx::Size& pixel_size, float scale_factor);
 
   scoped_ptr<StorageProvider> storage_provider_;
 
   // Tracks the current buffer allocation state.
   bool backbuffer_suggested_allocation_;
   bool frontbuffer_suggested_allocation_;
 
   uint32 fbo_id_;
   GLuint texture_id_;
   GLuint depth_stencil_renderbuffer_id_;
   bool has_complete_framebuffer_;
 
   // Weak pointer to the context that this was last made current to.
   gfx::GLContext* context_;
 
-  gfx::Size size_;
-  gfx::Size rounded_size_;
+  gfx::Size pixel_size_;
+  gfx::Size rounded_pixel_size_;
   float scale_factor_;
 
   // Whether or not we've successfully made the surface current once.
   bool made_current_;
 
   // Whether a SwapBuffers IPC needs to be sent to the browser.
   bool is_swap_buffers_send_pending_;
   std::vector<ui::LatencyInfo> latency_info_;
 
   scoped_ptr<ImageTransportHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
 };
 
 }  // namespace content
 
 #endif  //  CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_MAC_H_