gpu: Refactor memory buffer handling code out of content.

gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.cc

 // 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.
 
 #include "gpu/ipc/client/gpu_memory_buffer_impl_shared_memory.h"
 
 #include <stdint.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 46 matching lines @@
       gfx::RowSizeForBufferFormat(size.width(), format, 0)));
 }
 
 // static
 gfx::GpuMemoryBufferHandle
 GpuMemoryBufferImplSharedMemory::AllocateForChildProcess(
     gfx::GpuMemoryBufferId id,
     const gfx::Size& size,
     gfx::BufferFormat format,
     base::ProcessHandle child_process) {
+  // TODO(sad): This should just be Allocate. The returned
+  // GpuMemoryBufferHandle::handle should be set to |shared_memory.handle()|.
+  // The caller can then decide how to share that handle with the child process
+  // (non-mojo would use GiveToProcess, and mojo would use
+  // WrapSharedMemoryHandle).
   size_t buffer_size = 0u;
   if (!gfx::BufferSizeForBufferFormatChecked(size, format, &buffer_size))
     return gfx::GpuMemoryBufferHandle();
 
   base::SharedMemory shared_memory;
   if (!shared_memory.CreateAnonymous(buffer_size))
     return gfx::GpuMemoryBufferHandle();
 
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SHARED_MEMORY_BUFFER;
@@ skipping 140 matching lines @@
   gfx::GpuMemoryBufferHandle handle;
   handle.type = gfx::SHARED_MEMORY_BUFFER;
   handle.id = id_;
   handle.offset = offset_;
   handle.stride = stride_;
   handle.handle = shared_memory_->handle();
   return handle;
 }
 
 }  // namespace gpu