Listen OnDisplayMetricsChanged on lock screen

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

Index: chrome/browser/chromeos/login/lock/webui_screen_locker.h
diff --git a/chrome/browser/chromeos/login/lock/webui_screen_locker.h b/chrome/browser/chromeos/login/lock/webui_screen_locker.h
index 95b30655e343e9971e9728e4a762eab00eda8984..c1f7b4c43af5813b7871b4ee2f382c7903f2a76c 100644
--- a/chrome/browser/chromeos/login/lock/webui_screen_locker.h
+++ b/chrome/browser/chromeos/login/lock/webui_screen_locker.h
@@ -20,6 +20,7 @@
 #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"
@@ -52,7 +53,8 @@ class WebUIScreenLocker : public WebUILoginView,
                           public views::WidgetObserver,
                           public PowerManagerClient::Observer,
                           public ash::VirtualKeyboardStateObserver,
-                          public keyboard::KeyboardControllerObserver {
+                          public keyboard::KeyboardControllerObserver,
+                          public gfx::DisplayObserver {
  public:
   explicit WebUIScreenLocker(ScreenLocker* screen_locker);
 
@@ -112,6 +114,12 @@ class WebUIScreenLocker : public WebUILoginView,
   // 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();