Implement Clipboard::ReadData and Clipboard::WriteData for Mac.

ui/base/clipboard/clipboard_aurax11.cc

 // Copyright (c) 2011 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.
 
 #include "ui/base/clipboard/clipboard.h"
 
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "ui/gfx/linux_util.h"
@@ skipping 242 matching lines @@
 }
 
 void Clipboard::ReadFile(FilePath* file) const {
   NOTIMPLEMENTED();
 }
 
 void Clipboard::ReadFiles(std::vector<FilePath>* files) const {
   NOTIMPLEMENTED();
 }
 
-void Clipboard::ReadData(const std::string& format, std::string* result) {
+void Clipboard::ReadData(const std::string& format, std::string* result) const {
   result->clear();
   ClipboardData* data = GetClipboardData();
   if (data->custom_data_format() == format)
     *result = std::string(data->custom_data_data(), data->custom_data_len());
 }
 
 uint64 Clipboard::GetSequenceNumber(Buffer buffer) {
   NOTIMPLEMENTED();
   return 0;
 }
@@ skipping 51 matching lines @@
 Clipboard::FormatType Clipboard::GetBitmapFormatType() {
   return std::string(kMimeTypeBitmap);
 }
 
 // static
 Clipboard::FormatType Clipboard::GetWebKitSmartPasteFormatType() {
   return std::string(kMimeTypeWebkitSmartPaste);
 }
 
 }  // namespace ui