Upstream iOS' Open from Clipboard component.

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
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+++ b/components/open_from_clipboard/clipboard_recent_content_ios.h
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+// 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 "components/open_from_clipboard/clipboard_recent_content.h"
+#include "url/gurl.h"
+
+@class NSDate;
+@class PasteboardNotificationListenerBridge;
+
+template <typename T>
+struct DefaultSingletonTraits;
+
+// IOS implementation of ClipboardRecentContent
+class ClipboardRecentContentIOS : public ClipboardRecentContent {
+ public:
+  static ClipboardRecentContentIOS* GetInstance();
+  // Notifies that the content of the pasteboard may have changed.
+  void PasteboardChanged();
+
+  // ClipboardRecentContent implementation.
+  bool GetRecentURLFromClipboard(GURL* url) const override;
+
+ private:
+  friend struct DefaultSingletonTraits<ClipboardRecentContentIOS>;
+
+  ClipboardRecentContentIOS();
+  ~ClipboardRecentContentIOS() override;
+  // Loads information from the user defaults about the latest clipboard entry.
+  void LoadFromUserDefaults();
+  // Saves information to the user defaults about the latest clipboard entry.
+  void SaveToUserDefaults();
+  // Returns the URL contained in the clipboard (if any).
+  GURL URLFromPasteboard();
+
+  // The pasteboard's change count. Increases everytime the pasteboard changes.
+  NSInteger lastPasteboardChangeCount_;
+  // Estimation of the date when the pasteboard changed.
+  base::scoped_nsobject<NSDate> lastPasteboardChangeDate_;
+  // Cache of the GURL contained in the pasteboard (if any).
+  GURL urlFromPasteboardCache_;
+  // Bridge to receive notification when the pasteboard changes.
+  base::scoped_nsobject<PasteboardNotificationListenerBridge>
+      notificationBridge_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardRecentContentIOS);
+};
+
+#endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_IOS_H_