[cros] Change how we track momemt to emit login-prompt-visible signal.

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

 // Copyright (c) 2012 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/chromeos/login/signin_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/command_line.h"
@@ skipping 478 matching lines @@
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("userImagesLoaded",
       base::Bind(&SigninScreenHandler::HandleUserImagesLoaded,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("networkErrorShown",
       base::Bind(&SigninScreenHandler::HandleNetworkErrorShown,
                  base::Unretained(this)));
   web_ui()->RegisterMessageCallback("openProxySettings",
       base::Bind(&SigninScreenHandler::HandleOpenProxySettings,
                  base::Unretained(this)));
+  web_ui()->RegisterMessageCallback("loginVisible",
+      base::Bind(&SigninScreenHandler::HandleLoginVisible,
+                 base::Unretained(this)));
 }
 
 void SigninScreenHandler::HandleGetUsers(const base::ListValue* args) {
   SendUserList(false);
 }
 
 void SigninScreenHandler::ClearAndEnablePassword() {
   base::FundamentalValue force_online(false);
   web_ui()->CallJavascriptFunction("cr.ui.Oobe.resetSigninUI", force_online);
 }
@@ skipping 499 matching lines @@
 void SigninScreenHandler::HandleCreateAccount(const base::ListValue* args) {
   if (!delegate_)
     return;
   delegate_->CreateAccount();
 }
 
 void SigninScreenHandler::HandleOpenProxySettings(const base::ListValue* args) {
   BaseLoginDisplayHost::default_host()->OpenProxySettings();
 }
 
+void SigninScreenHandler::HandleLoginVisible(const base::ListValue* args) {
+  content::NotificationService::current()->Notify(
+      chrome::NOTIFICATION_LOGIN_WEBUI_VISIBLE,
+      content::NotificationService::AllSources(),
+      content::NotificationService::NoDetails());
+}
+
 void SigninScreenHandler::StartClearingDnsCache() {
   if (dns_clear_task_running_ || !g_browser_process->io_thread())
     return;
 
   dns_cleared_ = false;
   BrowserThread::PostTaskAndReply(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ClearDnsCache, g_browser_process->io_thread()),
       base::Bind(&SigninScreenHandler::OnDnsCleared,
                  weak_factory_.GetWeakPtr()));
@@ skipping 26 matching lines @@
       !dns_clear_task_running_ &&
       network_state_informer_->is_online()) {
     gaia_silent_load_ = true;
     gaia_silent_load_network_ =
         network_state_informer_->active_network_service_path();
     LoadAuthExtension(true, true, false);
   }
 }
 
 }  // namespace chromeos