Media Galleries API: Audio/Video attached pictures support.

chrome/renderer/resources/extensions/media_galleries_custom_bindings.js

 // Copyright (c) 2012 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.
 
 // Custom binding for the Media Gallery API.
 
 var binding = require('binding').Binding.create('mediaGalleries');
 var blobNatives = requireNative('blob_natives');
 var mediaGalleriesNatives = requireNative('mediaGalleries');
 
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       'isMediaDevice': false,
       'isAvailable': false,
     };
   });
 
   apiFunctions.setUpdateArgumentsPostValidate('getMetadata',
       function(mediaFile, options, callback) {
     var blobUuid = blobNatives.GetBlobUuid(mediaFile)
     return [blobUuid, options, callback];
   });
+
+  apiFunctions.setCustomCallback('getMetadata',
+                                 function(name, request, response) {
+    var metadata = response[0];
+    var attachedPicturesBytes = response[1];
+    var attachedPicturesTypes = response[2];
+    for (var i = 0; i < attachedPicturesBytes.length; i++) {
+      var dataView = new DataView(attachedPicturesBytes[i]);
+      var blob = new Blob([dataView], {type : attachedPicturesTypes[i]});
+      metadata.attachedPictures.push(blob);
+    }
+
+    if (request.callback)
+      request.callback(metadata);
+    request.callback = null;
+  });
 });
 
 exports.binding = binding.generate();