Media Galleries API: Audio/Video attached pictures support.

chrome/renderer/resources/extensions/media_galleries_custom_bindings.js

Index: chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/media_galleries_custom_bindings.js b/chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
index 9b51fcc271685b3f9afbc0011f1aa4decbeb0cdd..a66e747892680a9cc9e9c4d89ce0509286534aa0 100644
--- a/chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/media_galleries_custom_bindings.js
@@ -103,6 +103,22 @@ binding.registerCustomHook(function(bindingsAPI, extensionId) {
     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();