Listen OnDisplayMetricsChanged on lock screen

chrome/browser/chromeos/login/lock/webui_screen_locker.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_
 
 #include <string>
 
 #include "ash/shell_delegate.h"
 #include "ash/wm/lock_state_observer.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
 #include "chrome/browser/chromeos/login/lock/screen_locker_delegate.h"
 #include "chrome/browser/chromeos/login/signin_screen_controller.h"
 #include "chrome/browser/chromeos/login/signin_specifics.h"
 #include "chrome/browser/chromeos/login/ui/lock_window.h"
 #include "chrome/browser/chromeos/login/ui/login_display.h"
 #include "chrome/browser/chromeos/login/ui/webui_login_view.h"
 #include "chromeos/dbus/power_manager_client.h"
+#include "ui/gfx/display_observer.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace content {
 class WebUI;
 }
 
 namespace chromeos {
 
@@ skipping 12 matching lines @@
 // This version of ScreenLockerDelegate displays a WebUI lock screen based on
 // the Oobe account picker screen.
 class WebUIScreenLocker : public WebUILoginView,
                           public LoginDisplay::Delegate,
                           public ScreenLockerDelegate,
                           public LockWindow::Observer,
                           public ash::LockStateObserver,
                           public views::WidgetObserver,
                           public PowerManagerClient::Observer,
                           public ash::VirtualKeyboardStateObserver,
-                          public keyboard::KeyboardControllerObserver {
+                          public keyboard::KeyboardControllerObserver,
+                          public gfx::DisplayObserver {
  public:
   explicit WebUIScreenLocker(ScreenLocker* screen_locker);
 
   // ScreenLockerDelegate implementation.
   void LockScreen() override;
   void ScreenLockReady() override;
   void OnAuthenticate() override;
   void SetInputEnabled(bool enabled) override;
   void ShowErrorMessage(int error_msg_id,
                         HelpAppLauncher::HelpTopic help_topic_id) override;
@@ skipping 39 matching lines @@
 
   // Overridden from content::WebContentsObserver:
   void RenderProcessGone(base::TerminationStatus status) override;
 
   // Overridden from ash::KeyboardStateObserver:
   void OnVirtualKeyboardStateChanged(bool activated) override;
 
   // Overridden from keyboard::KeyboardControllerObserver:
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
 
+  // Overridden from gfx::DisplayObserver:

[oshima, 2015/01/29 15:29:06]

nit: can you update these comments to new style?

[Dmitry Polukhin, 2015/01/29 15:39:17]

Sorry, what do you mean by "new style"? I don't see anything related in style
guide http://dev.chromium.org/developers/coding-style

[oshima, 2015/01/29 16:16:09]

// ClassName:

like 

// gfx::DisplayObserver:

no "Overridden from" or "implmenetation."

[Dmitry Polukhin, 2015/01/30 13:08:08]

Done.

+  void OnDisplayAdded(const gfx::Display& new_display) override;
+  void OnDisplayRemoved(const gfx::Display& old_display) override;
+  void OnDisplayMetricsChanged(const gfx::Display& display,
+                               uint32_t changed_metrics) override;
+
   // Returns instance of the OOBE WebUI.
   OobeUI* GetOobeUI();
 
  private:
   friend class test::WebUIScreenLockerTester;
 
   ~WebUIScreenLocker() override;
 
   // Ensures that user pod is focused.
   void FocusUserPod();
@@ skipping 25 matching lines @@
   gfx::Rect keyboard_bounds_;
 
   base::WeakPtrFactory<WebUIScreenLocker> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebUIScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOCK_WEBUI_SCREEN_LOCKER_H_