Upstream code and resources for Chrome on iOS extensions.

ios/chrome/today_extension/lock_screen_state.h

+// Copyright 2015 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 IOS_CHROME_TODAY_EXTENSION_LOCK_SCREEN_STATE_H_
+#define IOS_CHROME_TODAY_EXTENSION_LOCK_SCREEN_STATE_H_
+
+#import <Foundation/Foundation.h>
+
+@protocol LockScreenStateDelegate;
+
+// A shared object to track screen lock state. Object is statically allocated
+// to get notification even when widget is not displayed.
+@interface LockScreenState : NSObject
+
++ (instancetype)sharedInstance;
+
+// Whether or not the screen is currently locked.
+// The value can be temporary |NO| on lock screen if the widget is allocated
+// in the 10 seconds following the lock.
+@property(nonatomic, readonly) BOOL isScreenLocked;
+
+// Sets the delegate to receive future |lockScreenStateDidChange:|
+// notifications.
+- (void)setDelegate:(id<LockScreenStateDelegate>)delegate;
+
+@end
+
+@protocol LockScreenStateDelegate<NSObject>
+
+- (void)lockScreenStateDidChange:(LockScreenState*)lockScreenState;
+
+@end
+
+#endif  // IOS_CHROME_TODAY_EXTENSION_LOCK_SCREEN_STATE_H_