ServiceWorker: Implement WebServiceWorkerRegistrationImpl::proxy()

Blink-side change: https://codereview.chromium.org/473743002/


BUG=396400
TEST=https://codereview.chromium.org/466723002/
NOTRY=true

Review URL: https://codereview.chromium.org/470843002

Cr-Commit-Position: refs/heads/master@{#289475}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289475 0039d316-1c4b-4281-b951-d872f2087c98

content/child/service_worker/web_service_worker_registration_impl.cc

@@ -41,6 +41,11 @@ void WebServiceWorkerRegistrationImpl::setProxy(
   proxy_ = proxy;
 }
 
+blink::WebServiceWorkerRegistrationProxy*
+WebServiceWorkerRegistrationImpl::proxy() {
+  return proxy_;
+}
+
 void WebServiceWorkerRegistrationImpl::setInstalling(
     blink::WebServiceWorker* service_worker) {
   DCHECK(proxy_);

content/child/service_worker/web_service_worker_registration_impl.h

@@ -29,6 +29,7 @@ class WebServiceWorkerRegistrationImpl
   void OnUpdateFound();
 
   virtual void setProxy(blink::WebServiceWorkerRegistrationProxy* proxy);
+  virtual blink::WebServiceWorkerRegistrationProxy* proxy();
   virtual void setInstalling(blink::WebServiceWorker* service_worker);
   virtual void setWaiting(blink::WebServiceWorker* service_worker);
   virtual void setActive(blink::WebServiceWorker* service_worker);