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

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 313 matching lines @@
       base::Bind(&MediaRouterWebUIMessageHandler::OnInitialDataReceived,
                  base::Unretained(this)));
 }
 
 void MediaRouterWebUIMessageHandler::OnRequestInitialData(
     const base::ListValue* args) {
   DVLOG(1) << "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));
 
   scoped_ptr<base::ListValue> sinks(SinksToValue(media_router_ui_->sinks()));
   initial_data.Set("sinks", sinks.release());
 
   scoped_ptr<base::ListValue> routes(RoutesToValue(media_router_ui_->routes(),
       media_router_ui_->joinable_route_ids(),
       media_router_ui_->GetRouteProviderExtensionId()));
@@ skipping 287 matching lines @@
     open_args->AppendString(learn_more_url);
     web_ui()->CallJavascriptFunction(kWindowOpen, *open_args);
     return true;
   } else {
     // Do nothing; no other issue action types require any other action.
     return true;
   }
 }
 
 }  // namespace media_router