[Media Router] Show user email in header if cloud sink is present.

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

Index: chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h
diff --git a/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h b/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h
index b18009e29d05c7ff212c5fe423b07a29231b5adb..8c7813f48f4a29b8675c753926f5d82265df0517 100644
--- a/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h
+++ b/chrome/browser/ui/webui/media_router/media_router_webui_message_handler.h
@@ -11,6 +11,7 @@
 #include "chrome/browser/media/router/issue.h"
 #include "chrome/browser/ui/webui/media_router/media_cast_mode.h"
 #include "chrome/browser/ui/webui/media_router/media_sink_with_cast_modes.h"
+#include "components/signin/core/browser/account_info.h"
 #include "content/public/browser/web_ui_message_handler.h"
 #include "ui/gfx/geometry/size.h"
 
@@ -89,6 +90,8 @@ class MediaRouterWebUIMessageHandler : public content::WebUIMessageHandler {
   // initializing the WebUI.
   void MaybeUpdateFirstRunFlowData();
 
+  virtual AccountInfo GetAccountInfo();

[imcheng, 2016/02/25 01:52:45]

add a comment here and it is marked virtual for tests.

[amp, 2016/02/25 03:01:15]

Done.

+
   // Keeps track of whether a command to close the dialog has been issued.
   bool dialog_closing_;