MacViews: Partially implement OSExchangeDataProviderMac.

ui/base/dragdrop/os_exchange_data_provider_mac.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_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_MAC_H_
 #define UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_MAC_H_
 
+#import "base/mac/scoped_nsobject.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
 
+@class NSPasteboard;
+
 namespace ui {
 
 // OSExchangeData::Provider implementation for Mac.
 class UI_BASE_EXPORT OSExchangeDataProviderMac
     : public OSExchangeData::Provider {
  public:
   OSExchangeDataProviderMac();
+  explicit OSExchangeDataProviderMac(NSPasteboard* pasteboard);
   virtual ~OSExchangeDataProviderMac();
 
   // Overridden from OSExchangeData::Provider:
   virtual Provider* Clone() const OVERRIDE;
   virtual void MarkOriginatedFromRenderer() OVERRIDE;
   virtual bool DidOriginateFromRenderer() const OVERRIDE;
   virtual void SetString(const base::string16& data) OVERRIDE;
   virtual void SetURL(const GURL& url, const base::string16& title) OVERRIDE;
   virtual void SetFilename(const base::FilePath& path) OVERRIDE;
   virtual void SetFilenames(const std::vector<FileInfo>& filenames) OVERRIDE;
   virtual void SetPickledData(const OSExchangeData::CustomFormat& format,
                               const Pickle& data) OVERRIDE;
   virtual bool GetString(base::string16* data) const OVERRIDE;
   virtual bool GetURLAndTitle(OSExchangeData::FilenameToURLPolicy policy,
                               GURL* url,
                               base::string16* title) const OVERRIDE;
   virtual bool GetFilename(base::FilePath* path) const OVERRIDE;
   virtual bool GetFilenames(std::vector<FileInfo>* filenames) const OVERRIDE;
   virtual bool GetPickledData(const OSExchangeData::CustomFormat& format,
                               Pickle* data) const OVERRIDE;
   virtual bool HasString() const OVERRIDE;
   virtual bool HasURL(
       OSExchangeData::FilenameToURLPolicy policy) const OVERRIDE;
   virtual bool HasFile() const OVERRIDE;
   virtual bool HasCustomFormat(
       const OSExchangeData::CustomFormat& format) const OVERRIDE;
 
  private:
+  base::scoped_nsobject<NSPasteboard> pasteboard_;
+
   DISALLOW_COPY_AND_ASSIGN(OSExchangeDataProviderMac);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_DRAGDROP_OS_EXCHANGE_DATA_PROVIDER_MAC_H_