content: Cleanup GpuMemoryBuffer allocation.

content/common/gpu/client/gpu_memory_buffer_impl_shm.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_SHM_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHM_H_
 
 #include "content/common/gpu/client/gpu_memory_buffer_impl.h"
 
 namespace content {
 
-// Provides implementation of a GPU memory buffer based
-// on a shared memory handle.
+// Implementation of GPU memory buffer based on shared memory.
 class GpuMemoryBufferImplShm : public GpuMemoryBufferImpl {
  public:
-  GpuMemoryBufferImplShm(gfx::Size size, unsigned internalformat);
+  GpuMemoryBufferImplShm(const gfx::Size& size, unsigned internalformat);
   virtual ~GpuMemoryBufferImplShm();
 
+  // Allocates a shared memory backed GPU memory buffer with |size| and
+  // |internalformat| for use by |child_process|.
+  static void AllocateSharedMemoryForChildProcess(
+      const gfx::Size& size,
+      unsigned internalformat,
+      base::ProcessHandle child_process,
+      gfx::GpuMemoryBufferHandle* handle);
+
+  static bool IsLayoutSupported(const gfx::Size& size, unsigned internalformat);
   static bool IsUsageSupported(unsigned usage);
+  static bool IsConfigurationSupported(const gfx::Size& size,
+                                       unsigned internalformat,
+                                       unsigned usage);
 
-  bool Initialize(gfx::GpuMemoryBufferHandle handle);
-  bool InitializeFromSharedMemory(scoped_ptr<base::SharedMemory> shared_memory);
+  bool Initialize();
+  bool InitializeFromHandle(gfx::GpuMemoryBufferHandle handle);
 
   // Overridden from gfx::GpuMemoryBuffer:
   virtual void* Map() OVERRIDE;
   virtual void Unmap() OVERRIDE;
+  virtual uint32 GetStride() const OVERRIDE;
   virtual gfx::GpuMemoryBufferHandle GetHandle() const OVERRIDE;
 
  private:
   scoped_ptr<base::SharedMemory> shared_memory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplShm);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHM_H_