Password in user pods clears after minute of idle state.

chrome/browser/chromeos/login/webui_login_display.h

Index: chrome/browser/chromeos/login/webui_login_display.h
diff --git a/chrome/browser/chromeos/login/webui_login_display.h b/chrome/browser/chromeos/login/webui_login_display.h
index bb149f84fc54126187f51753bb58c8bb2a3096ea..913201c440ddc3149d8820c3899a2a85fd5fd3dc 100644
--- a/chrome/browser/chromeos/login/webui_login_display.h
+++ b/chrome/browser/chromeos/login/webui_login_display.h
@@ -8,7 +8,9 @@
 #include <string>
 #include <vector>
 
+#include "ash/wm/user_activity_observer.h"
 #include "base/compiler_specific.h"
+#include "base/timer.h"
 #include "chrome/browser/chromeos/login/login_display.h"
 #include "chrome/browser/chromeos/login/user.h"
 #include "chrome/browser/ui/webui/chromeos/login/native_window_delegate.h"
@@ -19,7 +21,8 @@ namespace chromeos {
 // WebUI-based login UI implementation.
 class WebUILoginDisplay : public LoginDisplay,
                           public NativeWindowDelegate,
-                          public SigninScreenHandlerDelegate {
+                          public SigninScreenHandlerDelegate,
+                          public ash::UserActivityObserver {
  public:
   explicit WebUILoginDisplay(LoginDisplay::Delegate* delegate);
   virtual ~WebUILoginDisplay();
@@ -78,7 +81,13 @@ class WebUILoginDisplay : public LoginDisplay,
   virtual void SetDisplayEmail(const std::string& email) OVERRIDE;
   virtual void Signout() OVERRIDE;
 
+  // UserActivityDetector implementation:
+  virtual void OnUserActivity() OVERRIDE;
+
  private:
+  void StartPasswordClearTimer();
+  void OnPasswordClearTimerExpired();
+
   // Set of Users that are visible.
   UserList users_;
 
@@ -91,6 +100,9 @@ class WebUILoginDisplay : public LoginDisplay,
   // Whether to show add new user.
   bool show_new_user_;
 
+  // Timer for measuring idle state duration before password clear.
+  base::OneShotTimer<WebUILoginDisplay> password_clear_timer_;
+
   // Reference to the WebUI handling layer for the login screen
   LoginDisplayWebUIHandler* webui_handler_;