Add Generic Implementation of ClipboardRecentContent

ui/base/test/test_clipboard.h

 // Copyright 2014 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 UI_BASE_TEST_TEST_CLIPBOARD_H_
 #define UI_BASE_TEST_TEST_CLIPBOARD_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 
 #include "base/macros.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/base/clipboard/clipboard.h"
 
 namespace ui {
 
 class TestClipboard : public Clipboard {
  public:
   TestClipboard();
   ~TestClipboard() override;
 
   // Creates and associates a TestClipboard with the current thread. When no
   // longer needed, the returned clipboard must be freed by calling
   // Clipboard::DestroyClipboardForCurrentThread() on the same thread.
   static Clipboard* CreateForCurrentThread();
 
+  // Sets the time to be returned by GetClipboardLastModifiedTime();
+  void SetClipboardLastModifiedTime(const base::Time& time);
+
   // Clipboard overrides.
   void OnPreShutdown() override;
   uint64_t GetSequenceNumber(ClipboardType type) const override;
   bool IsFormatAvailable(const FormatType& format,
                          ClipboardType type) const override;
   void Clear(ClipboardType type) override;
   void ReadAvailableTypes(ClipboardType type,
                           std::vector<base::string16>* types,
                           bool* contains_filenames) const override;
   void ReadText(ClipboardType type, base::string16* result) const override;
   void ReadAsciiText(ClipboardType type, std::string* result) const override;
   void ReadHTML(ClipboardType type,
                 base::string16* markup,
                 std::string* src_url,
                 uint32_t* fragment_start,
                 uint32_t* fragment_end) const override;
   void ReadRTF(ClipboardType type, std::string* result) const override;
   SkBitmap ReadImage(ClipboardType type) const override;
   void ReadCustomData(ClipboardType clipboard_type,
                       const base::string16& type,
                       base::string16* result) const override;
   void ReadBookmark(base::string16* title, std::string* url) const override;
   void ReadData(const FormatType& format, std::string* result) const override;
+  base::Time GetClipboardLastModifiedTime() const override;
   void WriteObjects(ClipboardType type, const ObjectMap& objects) override;
   void WriteText(const char* text_data, size_t text_len) override;
   void WriteHTML(const char* markup_data,
                  size_t markup_len,
                  const char* url_data,
                  size_t url_len) override;
   void WriteRTF(const char* rtf_data, size_t data_len) override;
   void WriteBookmark(const char* title_data,
                      size_t title_len,
                      const char* url_data,
@@ skipping 18 matching lines @@
   };
 
   // The non-const versions increment the sequence number as a side effect.
   const DataStore& GetStore(ClipboardType type) const;
   const DataStore& GetDefaultStore() const;
   DataStore& GetStore(ClipboardType type);
   DataStore& GetDefaultStore();
 
   ClipboardType default_store_type_;
   mutable std::map<ClipboardType, DataStore> stores_;
+  base::Time last_modified_time_;
 
   DISALLOW_COPY_AND_ASSIGN(TestClipboard);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_TEST_TEST_CLIPBOARD_H_