[Media Router] Add cloud services learn more link to first run flow.

chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc

Index: chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc
diff --git a/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc b/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc
index 558392be1ab906683cf1dcc77d5e3ce185a2af91..93da6c1375b85c8c52be29f8059bd4e8c0d9b17a 100644
--- a/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc
+++ b/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.cc
@@ -331,6 +331,11 @@ void MediaRouterWebUIMessageHandler::OnRequestInitialData(
   media_router_ui_->OnUIInitiallyLoaded();
   base::DictionaryValue initial_data;
 
+#if defined(GOOGLE_CHROME_BUILD)
+  // "Casting to a Hangout from Chrome" Chromecast help center page.
+  initial_data.SetString("firstRunFlowCloudPrefLearnMoreUrl",
+      base::StringPrintf(kHelpPageUrlPrefix, 6320939));
+#endif  // defined(GOOGLE_CHROME_BUILD)
   // "No Cast devices found?" Chromecast help center page.
   initial_data.SetString("deviceMissingUrl",
       base::StringPrintf(kHelpPageUrlPrefix, 3249268));