Mojo multiple command buffer support and sample

mojo/services/public/interfaces/gpu/gpu.mojom

Index: mojo/services/public/interfaces/gpu/gpu.mojom
diff --git a/mojo/services/public/interfaces/gpu/gpu.mojom b/mojo/services/public/interfaces/gpu/gpu.mojom
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+// 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.
+
+import "mojo/services/gles2/command_buffer.mojom"
+import "mojo/services/public/interfaces/geometry/geometry.mojom"
+
+module mojo {
+
+interface Gpu {
+  CreateOnscreenGLES2Context(uint64 native_viewport_id, Size size, CommandBuffer& gles2_client);
+  CreateOffscreenGLES2Context(CommandBuffer& gles2_client);
+};
+
+}