Add embedder api for participating in gpu logic

content/public/browser/gpu_service_registry.cc

+// Copyright 2016 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/public/browser/gpu_service_registry.h"
+
+#include "content/browser/gpu/gpu_process_host.h"
+
+namespace content {
+
+ServiceRegistry* GetGpuServiceRegistry() {
+  GpuProcessHost* host =
+      GpuProcessHost::Get(GpuProcessHost::GPU_PROCESS_KIND_SANDBOXED,
+                          CAUSE_FOR_GPU_LAUNCH_GET_GPU_SERVICE_REGISTRY);
+  return host->GetServiceRegistry();
+}
+
+}  // namespace content