Add debugging info for software compositor swap.

content/renderer/gpu/compositor_software_output_device.h

 // Copyright (c) 2013 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_RENDERER_GPU_COMPOSITOR_SOFTWARE_OUTPUT_DEVICE_H_
 #define CONTENT_RENDERER_GPU_COMPOSITOR_SOFTWARE_OUTPUT_DEVICE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/shared_memory.h"
@@ skipping 31 matching lines @@
   // FindDamageDifferenceFrom).
   class Buffer {
    public:
     explicit Buffer(unsigned id, scoped_ptr<base::SharedMemory> mem);
     ~Buffer();
 
     unsigned id() const { return id_; }
 
     void* memory() const { return mem_->memory(); }
     base::SharedMemoryHandle handle() const { return mem_->handle(); }
+    base::SharedMemory* shared_memory() const { return mem_.get(); }
 
     bool free() const { return free_; }
     void SetFree(bool free) { free_ = free; }
 
     Buffer* parent() const { return parent_; }
     void SetParent(Buffer* parent, const gfx::Rect& damage);
 
     bool FindDamageDifferenceFrom(Buffer* buffer, SkRegion* result) const;
 
    private:
@@ skipping 26 matching lines @@
   unsigned next_buffer_id_;
   ScopedVector<Buffer> buffers_;
   ScopedVector<Buffer> awaiting_ack_;
   SkBitmap bitmap_;
   RenderThread* render_thread_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_COMPOSITOR_SOFTWARE_OUTPUT_DEVICE_H_