Adding metrics for notification clicks and dismissals

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 234 matching lines @@
   },
   "mediaPlayerPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"],
     "location": "component"
   },
   "metricsPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app", "platform_app"],
     "whitelist": [
-      // The file manager is a component extension, and it can currently use
-      // whitelisted interfaces without being on the corresponding whitelist.
-      // Adding it to this whitelist documents its dependency, however, and also
-      // doesn't hurt anything.
+      // The file manager and Google Now are component extensions, and they can
+      // currently use whitelisted interfaces without being on the corresponding
+      // whitelist.
+      // Adding it to this whitelist documents their dependency, however, and
+      // also doesn't hurt anything.
       "hhaomjibdihmijegdhdafkllkbggdgoj",  // File manager
       "gbkeegbaiigmenfmjfclcdgdpimamgkj",  // Quickoffice
       "ionpfmkccalenbmnddpbmocokhaknphg",  // Quickoffice dev
       "bpmcpldpdmajfigpchkicefoigmkfalc",  // Quickoffice component extension
-      "ehibbfinohgbchlgdbfpikodjaojhccn"   // Editor
+      "ehibbfinohgbchlgdbfpikodjaojhccn",  // Editor
+      "pmofbkohncoogjjhahejjfbppikbjigm",  // Google Now
+      "iejldcgjigodajhjecapkeiggcncflph"   // Google Now dev
     ]
   },
   "nativeMessaging": [
     {
       "channel": "beta",
       "extension_types": [
         "extension", "packaged_app", "platform_app"
       ]
     },
     {
@@ skipping 216 matching lines @@
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
   "webview": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   }
 }