Asynchronously load wallpapers when user pod is selected.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
index 013d79b7173941bb084611c90c79f92d1e380796..f1f80b8cd78b4869a16322a48f6e440a328d0883 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.cc
@@ -452,6 +452,9 @@ void SigninScreenHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("shutdownSystem",
       base::Bind(&SigninScreenHandler::HandleShutdownSystem,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("userSelectedDelayed",
+      base::Bind(&SigninScreenHandler::HandleUserSelected,
+                 base::Unretained(this)));
   web_ui()->RegisterMessageCallback("removeUser",
       base::Bind(&SigninScreenHandler::HandleRemoveUser,
                  base::Unretained(this)));
@@ -773,6 +776,19 @@ void SigninScreenHandler::HandleShutdownSystem(const base::ListValue* args) {
 #endif
 }
 
+void SigninScreenHandler::HandleUserSelected(const base::ListValue* args) {
+  if (!delegate_)
+    return;
+
+  std::string email;
+  if (!args->GetString(0, &email)) {
+    NOTREACHED();
+    return;
+  }
+
+  delegate_->UserSelected(email);
+}
+
 void SigninScreenHandler::HandleRemoveUser(const base::ListValue* args) {
   if (!delegate_)
     return;