gpu: Reuse existing code for shared memory allocation.

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.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 GPU_IPC_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHARED_MEMORY_H_
 #define GPU_IPC_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHARED_MEMORY_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 11 matching lines @@
 
   static std::unique_ptr<GpuMemoryBufferImplSharedMemory> Create(
       gfx::GpuMemoryBufferId id,
       const gfx::Size& size,
       gfx::BufferFormat format,
       const DestructionCallback& callback);
 
   static gfx::GpuMemoryBufferHandle AllocateForChildProcess(
       gfx::GpuMemoryBufferId id,
       const gfx::Size& size,
-      gfx::BufferFormat format,
-      base::ProcessHandle child_process);
+      gfx::BufferFormat format);
 
   static std::unique_ptr<GpuMemoryBufferImplSharedMemory> CreateFromHandle(
       const gfx::GpuMemoryBufferHandle& handle,
       const gfx::Size& size,
       gfx::BufferFormat format,
       gfx::BufferUsage usage,
       const DestructionCallback& callback);
 
   static bool IsUsageSupported(gfx::BufferUsage usage);
   static bool IsConfigurationSupported(gfx::BufferFormat format,
@@ skipping 26 matching lines @@
   std::unique_ptr<base::SharedMemory> shared_memory_;
   size_t offset_;
   int stride_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplSharedMemory);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_IPC_CLIENT_GPU_MEMORY_BUFFER_IMPL_SHARED_MEMORY_H_