Enable file_handlers and chrome.app.runtime for QuickOffice.

extensions/common/api/_manifest_features.json

 // Copyright 2014 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 manifest keys implemented under src/extensions.
 // 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.
+
 {
   // The default platform app CSP can only be overridden by whitelisted apps.
   // This is a separate key from the top-level content_security_policy one since
   // we can't combine type restrictions with whitelisted ID restrictions. If
   // there is a need for additional whitelisted entries, the feature system
   // should instead be extended to support OR-ing of restrictions.
   "app.content_security_policy": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "min_manifest_version": 2,
@@ skipping 90 matching lines @@
       "extension_types": ["platform_app"],
       "location": "component"
     }
   ],
   "webview": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "min_manifest_version": 2
   }
 }