Begin to enable extension APIs in Extension Service Worker.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index aa1957b4736fcfd79942c814b3ad0f0ff4936a16..f245dc5f3fd245cd84aede51945861bfeffb967a 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -331,17 +331,22 @@ class CONTENT_EXPORT ContentRendererClient {
   // is called from the worker thread.
   virtual void DidInitializeServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
+      int embedded_worker_id,
       const GURL& url) {}
 
   // Notifies that a service worker context will be destroyed. This function
   // is called from the worker thread.
   virtual void WillDestroyServiceWorkerContextOnWorkerThread(
       v8::Local<v8::Context> context,
+      int embedded_worker_id,
       const GURL& url) {}
 
   // Whether this renderer should enforce preferences related to the WebRTC
   // routing logic, i.e. allowing multiple routes and non-proxied UDP.
   virtual bool ShouldEnforceWebRTCRoutingPreferences();
+
+  // Asks the renderer to install V8 extension for service workers.
+  virtual void InstallV8ExtensionForServiceWorkers() {}
 };
 
 }  // namespace content