Add user_gesture param to WebContentsImpl::Activate

content/browser/service_worker/service_worker_provider_host.cc

Index: content/browser/service_worker/service_worker_provider_host.cc
diff --git a/content/browser/service_worker/service_worker_provider_host.cc b/content/browser/service_worker/service_worker_provider_host.cc
index 6a79c56d753730f444f8e027745818d1db8ea1ea..59bc89f5db8dea2596e609c6c06b1c6497f191c8 100644
--- a/content/browser/service_worker/service_worker_provider_host.cc
+++ b/content/browser/service_worker/service_worker_provider_host.cc
@@ -50,8 +50,9 @@ ServiceWorkerClientInfo FocusOnUIThread(
   // Focus the frame's view to make sure the frame is now considered as focused.
   render_frame_host->GetView()->Focus();
 
-  // Move the web contents to the foreground.
-  web_contents->Activate();
+  // Move the web contents to the foreground. Service Workers only allow focus()
+  // to be called in reponse to a user gesture (e.g. notificationclick event).
+  web_contents->Activate(true /* user_gesture */);
 
   return ServiceWorkerProviderHost::GetWindowClientInfoOnUI(render_process_id,
                                                             render_frame_id);