ui: Prefer +/- operators to apply offsets.

content/common/gpu/image_transport_surface.h

 // Copyright (c) 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.
 
 #ifndef CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_
 
 #if defined(ENABLE_GPU)
 
 #include <vector>
@@ skipping 70 matching lines @@
                         const gfx::Rect& new_damage_rect,
                         std::vector<gfx::Rect>* regions);
 
  protected:
   virtual ~ImageTransportSurface();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ImageTransportSurface);
 };
 
-class ImageTransportHelper : public IPC::Listener {
+class ImageTransportHelper
+    : public IPC::Listener,
+      public base::SupportsWeakPtr<ImageTransportHelper> {
  public:
   // Takes weak pointers to objects that outlive the helper.
   ImageTransportHelper(ImageTransportSurface* surface,
                        GpuChannelManager* manager,
                        GpuCommandBufferStub* stub,
                        gfx::PluginWindowHandle handle);
   virtual ~ImageTransportHelper();
 
   bool Initialize();
   void Destroy();
@@ skipping 97 matching lines @@
   bool did_set_swap_interval_;
 
   DISALLOW_COPY_AND_ASSIGN(PassThroughImageTransportSurface);
 };
 
 }  // namespace content
 
 #endif  // defined(ENABLE_GPU)
 
 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_H_