Initial implementation of music manager private 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": "stable",
     "extension_types": ["extension", "packaged_app"],
     "min_manifest_version": 2
   },
@@ skipping 328 matching lines @@
       // also doesn't hurt anything.
       "hhaomjibdihmijegdhdafkllkbggdgoj",  // File manager
       "gbkeegbaiigmenfmjfclcdgdpimamgkj",  // Quickoffice
       "ionpfmkccalenbmnddpbmocokhaknphg",  // Quickoffice dev
       "bpmcpldpdmajfigpchkicefoigmkfalc",  // Quickoffice component extension
       "ehibbfinohgbchlgdbfpikodjaojhccn",  // Editor
       "pmofbkohncoogjjhahejjfbppikbjigm",  // Google Now
       "iejldcgjigodajhjecapkeiggcncflph"   // Google Now dev
     ]
   },
+  "musicManagerPrivate": {
+    "channel": "dev",
+    "extension_types": ["platform_app"],
+    "whitelist": [
+      "4B1D0E19C6C43C008C44A8278C8B5BFE15ABEB3C", // Music Manager
+      "B8F61FD1B25DE03706DBB8906A73261E4DBB992A"  // Test
+    ]
+  },
   "nativeMessaging": [
     {
       "channel": "beta",
       "extension_types": [
         "extension", "packaged_app", "platform_app"
       ]
     },
     {
       "channel": "stable",
       "extension_types": [
@@ skipping 217 matching lines @@
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
   "webview": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   }
 }