Rewrite implementation of ClipboardRecentContent in Objective C.

components/open_from_clipboard/clipboard_recent_content_ios.h

Index: components/open_from_clipboard/clipboard_recent_content_ios.h
diff --git a/components/open_from_clipboard/clipboard_recent_content_ios.h b/components/open_from_clipboard/clipboard_recent_content_ios.h
index d4b7d7ec831d06bd80e46dea4e7c04f23f0e2080..abbf510182e92e15c77756bcfc6078ebc34dd165 100644
--- a/components/open_from_clipboard/clipboard_recent_content_ios.h
+++ b/components/open_from_clipboard/clipboard_recent_content_ios.h
@@ -11,13 +11,16 @@
 #include "components/open_from_clipboard/clipboard_recent_content.h"
 #include "url/gurl.h"
 
+@class NSArray;
 @class NSDate;
 @class NSUserDefaults;
-@class ApplicationDidBecomeActiveNotificationListenerBridge;
+@class ClipboardRecentContentImplIOS;
 
-class ClipboardRecentContentIOSTest;
-
-// IOS implementation of ClipboardRecentContent
+// IOS implementation of ClipboardRecentContent.
+// A large part of the implementation is in clipboard_recent_content_impl_ios,
+// a GURL-free class that is used by some of the iOS extensions. Not using GURL
+// in extensions is preferable as GURL requires depending on ICU which makes the
+// extensions much larger.
 class ClipboardRecentContentIOS : public ClipboardRecentContent {
  public:
   // |application_scheme| is the URL scheme that can be used to open the
@@ -26,53 +29,22 @@ class ClipboardRecentContentIOS : public ClipboardRecentContent {
   // |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() override;
+  ClipboardRecentContentIOS(const std::string& application_scheme,
+                            NSUserDefaults* group_user_defaults);
 
-  // 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();
+  // Constructor that directly takes an |implementation|. For use in tests.
+  ClipboardRecentContentIOS(ClipboardRecentContentImplIOS* implementation);
 
-  // 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();
+  ~ClipboardRecentContentIOS() override;
 
   // 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);
 };