Mojo multiple command buffer support and sample

mojo/services/native_viewport/gpu_impl.h

Index: mojo/services/native_viewport/gpu_impl.h
diff --git a/mojo/services/native_viewport/gpu_impl.h b/mojo/services/native_viewport/gpu_impl.h
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+++ b/mojo/services/native_viewport/gpu_impl.h
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+// 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 "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "mojo/public/cpp/bindings/interface_impl.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/services/gles2/command_buffer.mojom.h"
+#include "mojo/services/public/interfaces/geometry/geometry.mojom.h"
+#include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
+
+namespace gfx {
+class GLShareGroup;
+}
+
+namespace gpu {
+namespace gles2 {
+class MailboxManager;
+}
+}
+
+namespace mojo {
+
+class GpuImpl : public InterfaceImpl<Gpu> {
+ public:
+  GpuImpl(const scoped_refptr<gfx::GLShareGroup>& share_group,
+          const scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager);
+
+  virtual ~GpuImpl();
+
+  virtual void CreateOnscreenGLES2Context(
+      uint64_t native_viewport_id,
+      SizePtr size,
+      InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE;
+
+  virtual void CreateOffscreenGLES2Context(
+      InterfaceRequest<CommandBuffer> command_buffer_request) OVERRIDE;
+
+ private:
+  // We need to share these across all NativeViewport instances so that contexts
+  // they create can share resources with each other via mailboxes.
+  scoped_refptr<gfx::GLShareGroup> share_group_;
+  scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
+
+  DISALLOW_COPY_AND_ASSIGN(GpuImpl);
+};
+
+}  // namespace mojo