content: Add GpuMemoryBuffer MemoryDumpProvider implementation.

content/common/gpu/client/gpu_memory_buffer_impl.h

 // Copyright 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_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
@@ skipping 18 matching lines @@
       const gfx::Size& size,
       Format format,
       const DestructionCallback& callback);
 
   // Type-checking upcast routine. Returns an NULL on failure.
   static GpuMemoryBufferImpl* FromClientBuffer(ClientBuffer buffer);
 
   // Returns the number of planes based on the format of the buffer.
   static size_t NumberOfPlanesForGpuMemoryBufferFormat(Format format);
 
-  // Calculates the number of bytes that an implementation must use to store
-  // one row of pixel data.
-  static bool StrideInBytes(size_t width,
-                            Format format,
-                            int plane,
-                            size_t* stride_in_bytes);
-
   // Returns the subsampling factor applied to the given zero-indexed |plane| of
   // the |format| both horizontally and vertically.
   static size_t SubsamplingFactor(Format format, int plane);
 
+  // Returns the number of bytes used to store a row of the given zero-indexed
+  // |plane| of |format|.
+  // Note: This is an approximation and the exact size used by an implementation
+  // might be different.
+  static bool RowSizeInBytes(size_t width,
+                             Format format,
+                             int plane,
+                             size_t* size_in_bytes);
+
+  // Returns the number of bytes used to store all the planes of a given
+  // |format|.
+  // Note: This is an approximation and the exact size used by an implementation
+  // might be different.
+  static bool BufferSizeInBytes(const gfx::Size& size,
+                                Format format,
+                                size_t* size_in_bytes);
+
   // Overridden from gfx::GpuMemoryBuffer:
   bool IsMapped() const override;
   Format GetFormat() const override;
   ClientBuffer AsClientBuffer() override;
 
   void set_destruction_sync_point(uint32 sync_point) {
     destruction_sync_point_ = sync_point;
   }
 
  protected:
   GpuMemoryBufferImpl(gfx::GpuMemoryBufferId id,
                       const gfx::Size& size,
                       Format format,
                       const DestructionCallback& callback);
 
   const gfx::GpuMemoryBufferId id_;
   const gfx::Size size_;
   const Format format_;
   const DestructionCallback callback_;
   bool mapped_;
   uint32 destruction_sync_point_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_