gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/common/gpu/client/gpu_memory_buffer_impl_ozone.cc

+// 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.
+
+#include "content/common/gpu/client/gpu_memory_buffer_impl.h"
+
+#include "content/common/gpu/client/gpu_memory_buffer_impl_shm.h"
+
+namespace content {
+
+scoped_ptr<GpuMemoryBufferImpl> GpuMemoryBufferImpl::Create(
+    gfx::GpuMemoryBufferHandle handle,
+    gfx::Size size,
+    unsigned internalformat) {
+  switch (handle.type) {
+    case gfx::SHARED_MEMORY_BUFFER: {
+      scoped_ptr<GpuMemoryBufferImplShm> buffer(
+          new GpuMemoryBufferImplShm(size, internalformat));
+      if (!buffer->Initialize(handle))
+        return scoped_ptr<GpuMemoryBufferImpl>();
+
+      return buffer.PassAs<GpuMemoryBufferImpl>();
+    }

[Ken Russell (switch to Gerrit), 2013/12/03 22:36:13]

It would be nice to figure out a way to share this duplicated code among all the
implementations.

[reveman, 2013/12/04 02:00:31]

An alternative is to add some "if defined(OS_*)" code to
gpu_memory_buffer_impl.cc but I find duplicated code a bit cleaner. I'm also
expecting these to diverge in the near future.

+    default:
+      return scoped_ptr<GpuMemoryBufferImpl>();
+  }
+}
+
+}  // namespace content