Add extension permissions for Media Gallery API.

chrome/common/extensions/api/_permission_features.json

 // 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.
 
 {
   "activeTab": {
     "channel": "dev",
     "extension_types": ["extension", "packaged_app"],
     "min_manifest_version": 2
   },
@@ skipping 161 matching lines @@
   },
   "managedModePrivate": {
     "channel": "dev",
     "extension_types": ["extension", "packaged_app"],
     "location": "component"
   },
   "management": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
+  "mediaGalleries": {
+    "channel": "stable",
+    "extension_types": [ "platform_app" ]
+  },
+  "mediaGalleriesAccessEverything": {
+    "channel": "stable",
+    "extension_types": [ "platform_app" ]
+  },
+  "mediaGalleriesRead": {
+    "channel": "stable",
+    "extension_types": [ "platform_app" ]
+  },
   "mediaPlayerPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"],
     "location": "component"
   },
   "metricsPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"],
     "location": "component"
   },
@@ skipping 112 matching lines @@
   },
   "webRequest": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   }
 }