Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/tabs/target_frame_cache.h

+// Copyright 2012 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_TABS_TARGET_FRAME_CACHE_H_
+#define IOS_CHROME_BROWSER_UI_TABS_TARGET_FRAME_CACHE_H_
+
+#import <UIKit/UIKit.h>
+
+#include <map>
+
+// Stores target frames for a set of UIViews.
+class TargetFrameCache {
+ public:
+  TargetFrameCache();
+  ~TargetFrameCache();
+
+  // Add or remove the target frame for a view.
+  void AddFrame(UIView* view, CGRect rect);
+  void RemoveFrame(UIView* view);
+
+  // Gets the cached target frame for |view|.
+  CGRect GetFrame(UIView* view);
+
+  // Returns whether |view| has a cached target frame.
+  bool HasFrame(UIView* view);
+
+ private:
+  std::map<UIView*, CGRect> targetFrames_;
+};
+
+#endif  // IOS_CHROME_BROWSER_UI_TABS_TARGET_FRAME_CACHE_H_