Enable file_handlers and chrome.app.runtime for QuickOffice.

chrome/common/extensions/api/_manifest_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 manifest keys implemented under src/chrome.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 {
   "app": {
@@ skipping 151 matching lines @@
     {
       "channel": "stable",
       "extension_types": ["extension", "legacy_packaged_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["platform_app"],
       "location": "component"
     }
   ],
-  "file_handlers": {
+  "file_handlers": [
+  {
     "channel": "stable",
     "extension_types": ["platform_app"]
-  },
+  }, {
+    "channel": "stable",
+    "extension_types": [ "extension"],
+    "whitelist": [
+      "gbkeegbaiigmenfmjfclcdgdpimamgkj",  // QuickOffice
+      "ionpfmkccalenbmnddpbmocokhaknphg",  // QuickOffice Dev
+      "bpmcpldpdmajfigpchkicefoigmkfalc"   // Quickoffice component extension
+    ]
+  }],
   "homepage_url": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "icons": {
     "channel": "stable",
     "extension_types": "all"
   },
   "import": {
     "channel": "stable",
@@ skipping 148 matching lines @@
   },
   "url_handlers": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "version": {
     "channel": "stable",
     "extension_types": "all"
   }
 }