Add extension permissions for Media Gallery API.

chrome/test/data/extensions/api_test/media_galleries/test.js

Index: chrome/test/data/extensions/api_test/media_galleries/test.js
diff --git a/chrome/test/data/extensions/api_test/media_gallery/test.js b/chrome/test/data/extensions/api_test/media_galleries/test.js
similarity index 95%
rename from chrome/test/data/extensions/api_test/media_gallery/test.js
rename to chrome/test/data/extensions/api_test/media_galleries/test.js
index 6302065f5d8abbbdfced24b1fb80aa76da91fd99..3d0d0b6bfa60d2799ed9d4f0605fafad5b53fd1f 100644
--- a/chrome/test/data/extensions/api_test/media_gallery/test.js
+++ b/chrome/test/data/extensions/api_test/media_galleries/test.js
@@ -11,6 +11,7 @@ var mediaFileSystemsListCallback = function(results) {
     expectedFileSystems = 0;
   }
   chrome.test.assertEq(expectedFileSystems, results.length);
+  // TODO(vandebo) Test that we can read from the file system object.
 };
 var nullCallback = function(result) {
   chrome.test.assertEq(null, result);