Add blink::ServiceRegistry and expose it from LocalFrame and Platform.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index 80613981ba14dd462bba29538f7a28b4f0fa65ba..6b4781552c654ace551122fb3f69a3eb2ce054f7 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1017,6 +1017,7 @@ RenderFrameImpl::RenderFrameImpl(const CreateParams& params)
       geolocation_dispatcher_(NULL),
       push_messaging_dispatcher_(NULL),
       presentation_dispatcher_(NULL),
+      blink_service_registry_(service_registry_.GetWeakPtr()),
       screen_orientation_dispatcher_(NULL),
       manifest_manager_(NULL),
       accessibility_mode_(AccessibilityModeOff),
@@ -5994,6 +5995,10 @@ void RenderFrameImpl::checkIfAudioSinkExistsAndIsAuthorized(
       routing_id_, 0, sink_id.utf8(), security_origin));
 }
 
+blink::ServiceRegistry* RenderFrameImpl::serviceRegistry() {
+  return &blink_service_registry_;
+}
+
 blink::WebPlugin* RenderFrameImpl::GetWebPluginForFind() {
   if (!is_main_frame_)
     return nullptr;