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 9426ed14004d3eaf9781378f324e80259e8f3a4a..2f10531fb0b052a0107f51e681b18e608c35ee29 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -1020,6 +1020,7 @@ 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),
@@ -6008,6 +6009,10 @@ void RenderFrameImpl::checkIfAudioSinkExistsAndIsAuthorized(
                    .device_status());
 }
 
+blink::ServiceRegistry* RenderFrameImpl::serviceRegistry() {
+  return &blink_service_registry_;
+}
+
 blink::WebPlugin* RenderFrameImpl::GetWebPluginForFind() {
   if (!is_main_frame_)
     return nullptr;