Change Clipboard to use virtual methods for testing purposes.

ui/base/clipboard/clipboard_aura.h

Index: ui/base/clipboard/clipboard_aura.h
diff --git a/ui/base/clipboard/clipboard_aura.h b/ui/base/clipboard/clipboard_aura.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb2fbc6ba4ec2a4b341aff9e47da4a5cd0bfda3b
--- /dev/null
+++ b/ui/base/clipboard/clipboard_aura.h
@@ -0,0 +1,63 @@
+// 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_CLIPBOARD_CLIPBOARD_AURA_H_
+#define UI_BASE_CLIPBOARD_CLIPBOARD_AURA_H_
+
+#include "ui/base/clipboard/clipboard.h"
+
+namespace ui {
+
+class ClipboardAura : public Clipboard {
+ private:
+  friend class Clipboard;
+
+  ClipboardAura();
+  ~ClipboardAura() override;
+
+  // Clipboard overrides:
+  uint64 GetSequenceNumber(ClipboardType type) 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* fragment_start,
+                uint32* 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;
+  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,
+                     size_t url_len) override;
+  void WriteWebSmartPaste() override;
+  void WriteBitmap(const SkBitmap& bitmap) override;
+  void WriteData(const FormatType& format,
+                 const char* data_data,
+                 size_t data_len) override;
+
+  DISALLOW_COPY_AND_ASSIGN(ClipboardAura);
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_CLIPBOARD_CLIPBOARD_AURA_H_