Add Generic Implementation of ClipboardRecentContent

components/open_from_clipboard/clipboard_recent_content_generic.h

Index: components/open_from_clipboard/clipboard_recent_content_generic.h
diff --git a/components/open_from_clipboard/clipboard_recent_content_generic.h b/components/open_from_clipboard/clipboard_recent_content_generic.h
new file mode 100644
index 0000000000000000000000000000000000000000..60024dc5b9c55639d7337e415d83ccb51a486b54
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+++ b/components/open_from_clipboard/clipboard_recent_content_generic.h
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+// Copyright 2017 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_GENERIC_H_
+#define COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_GENERIC_H_
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "components/open_from_clipboard/clipboard_recent_content.h"
+#include "url/gurl.h"
+
+// An implementation of ClipboardRecentContent that uses
+// ui/base/clipboard/clipboard.h
+// and hence works on all platforms for which Clipboard is implemented.
+// (This includes all platforms Chrome runs on except iOS.)
+// Note that on some platforms Clipboard may not implement the necessary
+// functions for this provider to function.  In those cases, it will not do
+// anything.
+class ClipboardRecentContentGeneric : public ClipboardRecentContent {
+ public:
+  explicit ClipboardRecentContentGeneric();
+
+  // ClipboardRecentContent implementation.
+  bool GetRecentURLFromClipboard(GURL* url) override;
+  base::TimeDelta GetClipboardContentAge() const override;
+  void SuppressClipboardContent() override;
+
+ private:
+  // When told to suppress clipboard content, store the time of the last
+  // modified clipboard and suppress suggestions that correspond to that time.
+  // Set to base::Time() if not suppressing clipboard content.
+  base::Time last_modified_time_to_suppress_;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardRecentContentGeneric);
+};
+
+#endif  // COMPONENTS_OPEN_FROM_CLIPBOARD_CLIPBOARD_RECENT_CONTENT_GENERIC_H_