Modify SetImageData to add additional items along with image data to save on clipboard.

chrome/browser/extensions/clipboard_extension_helper_chromeos.h

 // Copyright 2016 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 CHROME_BROWSER_EXTENSIONS_CLIPBOARD_EXTENSION_HELPER_CHROMEOS_H_
 #define CHROME_BROWSER_EXTENSIONS_CLIPBOARD_EXTENSION_HELPER_CHROMEOS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
+#include "extensions/browser/api/clipboard/clipboard_api.h"
 #include "extensions/common/api/clipboard.h"
 
 class SkBitmap;
 
 namespace extensions {
 
 // A helper class for decoding the image data and saving decoded image data on
 // clipboard, called from clipboard extension API.
 class ClipboardExtensionHelper {
  public:
+  struct AdditionalDataItem {

[Devlin, 2017/04/26 18:20:15]

How is this different from the generated type?

[jennyz, 2017/05/16 18:22:03]

Not really, so removed this struct, just use the generated type.

+    std::string type;
+    std::string data;
+  };
   ClipboardExtensionHelper();
   ~ClipboardExtensionHelper();
 
   // Decodes and saves the image data on clipboard. Must run on UI thread.
   void DecodeAndSaveImageData(
       const std::vector<char>& data,
       api::clipboard::ImageType type,
+      const AdditionalDataItemList& additional_items,
       const base::Closure& success_callback,
       const base::Callback<void(const std::string&)>& error_callback);
 
  private:
   // A class to decode PNG and JPEG file.
   class ClipboardImageDataDecoder;
 
   // Handles decoded image data.
   void OnImageDecoded(const SkBitmap& bitmap);
   // Handles image decoding failure case.
   void OnImageDecodeFailure();
   // Handles image decoding request cancelation case.
   void OnImageDecodeCancel();
 
   std::unique_ptr<ClipboardImageDataDecoder> clipboard_image_data_decoder_;
   base::Closure image_save_success_callback_;
   base::Callback<void(const std::string&)> image_save_error_callback_;
+  std::vector<AdditionalDataItem> additonal_items_;
 
   DISALLOW_COPY_AND_ASSIGN(ClipboardExtensionHelper);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CLIPBOARD_EXTENSION_HELPER_CHROMEOS_H_