Add new extension APIs related to animation policy.

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.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
 //
 // $ echo -n "aaaabbbbccccddddeeeeffffgggghhhh" | \
 // sha1sum | tr '[:lower:]' '[:upper:]'
 // 9A0417016F345C934A1A88F55CA17C05014EEEBA  -
 //
 // Google employees: please update http://go/chrome-api-whitelist to map
 // hashes back to ids.
 
 // If you add a new platform_app permission please update the "stubs_app" test:
 // chrome/test/data/extensions/api_test/stubs_app/manifest.json
 
 {
   "accessibilityFeatures.modify": {
     "channel": "stable",
-    "extension_types": ["extension", "platform_app"],
-    "platforms": ["chromeos"]
+    "extension_types": ["extension", "platform_app"]
   },
   "accessibilityFeatures.read": {
     "channel": "stable",
-    "extension_types": ["extension", "platform_app"],
-    "platforms": ["chromeos"]
+    "extension_types": ["extension", "platform_app"]
   },
   "accessibilityPrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
     "whitelist": [ "2FCBCE08B34CCA1728A85F1EFBD9A34DD2558B2E" ]
   },
   "activeTab": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"],
     "min_manifest_version": 2
@@ skipping 944 matching lines @@
   "webstorePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "hosted_app"],
     "whitelist": [
       "B44D08FD98F1523ED5837D78D0A606EA9D6206E5",  // Web Store
       "2653F6F6C39BC6EEBD36A09AFB92A19782FF7EB4",  // Enterprise Web Store
       "2779FA8B45841D61A37207CCFAC9CB393964FE5B"   // Login Proxy (prototype)
     ]
   }
 }