Implement empty WorkerInternals interface.

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 1900f397befb2d52a751b1a8e7f625eaa078d782..d96adc9a82a7067f2874fff2a3d1f4694e5c62bc 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -343,6 +343,11 @@ class CONTENT_EXPORT ContentRendererClient {
   // Whether this renderer should enforce preferences related to the WebRTC
   // routing logic, i.e. allowing multiple routes and non-proxied UDP.
   virtual bool ShouldEnforceWebRTCRoutingPreferences();
+
+  // Notifies that a worker context has been created. This function is called
+  // from the worker thread.
+  virtual void DidInitializeWorkerContextOnWorkerThread(
+      v8::Local<v8::Context> context) {}
 };
 
 }  // namespace content