Cancel partial screenshot UI when lock happens.

ash/shell_observer.h

Index: ash/shell_observer.h
diff --git a/ash/shell_observer.h b/ash/shell_observer.h
index d9852bcdf9285d43051936b3a603a158559a5571..66d2ba6bcc4862009a1bc6c20bdd49bb434988dc 100644
--- a/ash/shell_observer.h
+++ b/ash/shell_observer.h
@@ -15,6 +15,16 @@ class ASH_EXPORT ShellObserver {
   // Invoked after the screen's work area insets changes.
   virtual void OnMonitorWorkAreaInsetsChanged() {}
 
+  // Invoked when the user logs in.
+  virtual void OnLoginStateChanged(bool logged_in, bool is_guest) {}

[sky, 2012/04/18 14:41:12]

Are logged_in and is_guest mutually exclusive? Wouldn't an enum be better here?

[Jun Mukai, 2012/04/18 15:41:00]

Done.

+
+  // Invoked when the application is exiting.
+  virtual void OnAppTerminating() {}
+
+  // Invoked when the screen is locked (after the lock window is visible) or
+  // unlocked.
+  virtual void OnLockStateChanged(bool locked) {}
+
  protected:
   virtual ~ShellObserver() {}
 };