Upstream Chrome on iOS source code [8/11].

ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h

Index: ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h
diff --git a/ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h b/ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h
new file mode 100644
index 0000000000000000000000000000000000000000..492dd935d644f361a81444e31239b6fe56e37a57
--- /dev/null
+++ b/ios/chrome/browser/ui/settings/utils/pref_backed_boolean.h
@@ -0,0 +1,25 @@
+// Copyright 2016 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_BROWSER_UI_SETTINGS_UTILS_PREF_BACKED_BOOLEAN_H_
+#define IOS_CHROME_BROWSER_UI_SETTINGS_UTILS_PREF_BACKED_BOOLEAN_H_
+
+#import <Foundation/Foundation.h>
+
+#import "ios/chrome/browser/ui/settings/utils/observable_boolean.h"
+
+class PrefService;
+
+// An observable boolean backed by a pref from a PrefService.
+@interface PrefBackedBoolean : NSObject<ObservableBoolean>
+
+// Returns a PrefBackedBoolean backed by |prefName| from |prefs|.
+- (instancetype)initWithPrefService:(PrefService*)prefs
+                           prefName:(const char*)prefName
+    NS_DESIGNATED_INITIALIZER;
+- (instancetype)init NS_UNAVAILABLE;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SETTINGS_UTILS_PREF_BACKED_BOOLEAN_H_