Bring Chrome to the front when opening a URL from a notification

content/browser/service_worker/service_worker_client_utils.cc

Index: content/browser/service_worker/service_worker_client_utils.cc
diff --git a/content/browser/service_worker/service_worker_client_utils.cc b/content/browser/service_worker/service_worker_client_utils.cc
index 0cd39b270e3128d090b5857de356e7bb2917d231..dbd59d7f0a5df5dbd8ec600480a2856ae8b946ec 100644
--- a/content/browser/service_worker/service_worker_client_utils.cc
+++ b/content/browser/service_worker/service_worker_client_utils.cc
@@ -162,6 +162,13 @@ void DidOpenURLOnUI(const OpenURLCallback& callback,
     return;
   }
 
+  // ContentBrowserClient::OpenURL calls ui::BaseWindow::Show which
+  // makes the destination window the main+key window, but won't make Chrome
+  // the active application (https://crbug.com/470830). Since OpenWindow is
+  // always called from a user gesture (e.g. notification click), we should
+  // explicitly activate the window, which brings Chrome to the front.
+  static_cast<WebContentsImpl*>(web_contents)->Activate();
+
   RenderFrameHostImpl* rfhi =
       static_cast<RenderFrameHostImpl*>(web_contents->GetMainFrame());
   new OpenURLObserver(web_contents,