Rewrite implementation of ClipboardRecentContent in Objective C.

components/open_from_clipboard/clipboard_recent_content_ios.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 COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_
 #define COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "components/open_from_clipboard/clipboard_recent_content.h"
 #include "url/gurl.h"
 
+@class NSArray;
 @class NSDate;
 @class NSUserDefaults;
-@class ApplicationDidBecomeActiveNotificationListenerBridge;
-
-class ClipboardRecentContentIOSTest;
+@class ClipboardRecentContentImplIOS;
 
 // IOS implementation of ClipboardRecentContent

[jif, 2017/04/06 15:56:53]

Can you add

// IOS implementation of ClipboardRecentContent.
// A large part of the implementation is in clipboard_recent_content_impl_ios,
// a GURL-free class also used by iOS extensions. iOS extensions can't use GURL
// because GURL requires depending on ICU.

or something like that.
Not sure what's the correct name used for extensions.

[lody, 2017/04/06 16:34:24]

Done.

 class ClipboardRecentContentIOS : public ClipboardRecentContent {
  public:
   // |application_scheme| is the URL scheme that can be used to open the
   // current application, may be empty if no such scheme exists. Used to
   // determine whether or not the clipboard contains a relevant URL.
   // |group_user_defaults| is the NSUserDefaults used to store information on
   // pasteboard entry expiration. This information will be shared with other
   // application in the application group.
-  explicit ClipboardRecentContentIOS(const std::string& application_scheme,
-                                     NSUserDefaults* group_user_defaults);
+  ClipboardRecentContentIOS(const std::string& application_scheme,
+                            NSUserDefaults* group_user_defaults);
+
+  // Constructor that directly takes an |implementation|. For use in tests.
+  ClipboardRecentContentIOS(ClipboardRecentContentImplIOS* implementation);
+
   ~ClipboardRecentContentIOS() override;
 
-  // If the content of the pasteboard has changed, updates the change count,
-  // change date, and md5 of the latest pasteboard entry if necessary.
-  void UpdateIfNeeded();
-
-  // Returns whether the pasteboard changed since the last time a pasteboard
-  // change was detected.
-  bool HasPasteboardChanged() const;
-
-  // Loads information from the user defaults about the latest pasteboard entry.
-  void LoadFromUserDefaults();
-
   // ClipboardRecentContent implementation.
   bool GetRecentURLFromClipboard(GURL* url) override;
   base::TimeDelta GetClipboardContentAge() const override;
   void SuppressClipboardContent() override;
 
- protected:
-  // Returns the uptime. Override in tests to return custom value.
-  virtual base::TimeDelta Uptime() const;
-
  private:
-  friend class ClipboardRecentContentIOSTest;
-
-  // Saves information to the user defaults about the latest pasteboard entry.
-  void SaveToUserDefaults();
-
-  // Returns the URL contained in the clipboard (if any).
-  GURL URLFromPasteboard();
-
-  // Contains the URL scheme opening the app. May be empty.
-  std::string application_scheme_;
-  // The pasteboard's change count. Increases everytime the pasteboard changes.
-  NSInteger last_pasteboard_change_count_;
-  // Estimation of the date when the pasteboard changed.
-  base::scoped_nsobject<NSDate> last_pasteboard_change_date_;
-  // MD5 hash of the last registered pasteboard entry.
-  base::scoped_nsobject<NSData> last_pasteboard_entry_md5_;
-  // Bridge to receive notifications when the application becomes active.
-  base::scoped_nsobject<ApplicationDidBecomeActiveNotificationListenerBridge>
-      notification_bridge_;
-  // The user defaults from the app group used to optimize the pasteboard change
-  // detection.
-  base::scoped_nsobject<NSUserDefaults> shared_user_defaults_;
+  // The implementation instance.
+  base::scoped_nsobject<ClipboardRecentContentImplIOS> implementation_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardRecentContentIOS);
 };
 
 #endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_