Chrome app manifest support for action handlers.

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 chrome/common/extensions/api/_features.md to understand this file, as
 // well as feature.h, simple_feature.h, and base_feature_provider.h.
 
 {
+  "action_handlers": {

[Daniel Erat, 2017/01/12 23:55:03]

move this down to keep the list alphabetized

[michaelpg, 2017/01/13 22:17:07]

Does this have to be in //chrome/common/extensions/api instead of
//extension/common/api? Since the implementation is in //extensions  we could
make it available from there. Partly to decouple extensions APIs from Chrome,
and also to make it easier to potentially use APIs like this on app_shell.

[jdufault, 2017/01/14 00:30:42]

Done.

[jdufault, 2017/01/14 00:30:42]

Done.

+    "channel": "stable",
+    "extension_types": ["platform_app"]
+  },
   "about_page": {
     "channel": "stable",
     "extension_types": ["shared_module"]
   },
   "app.icon_color": {
     "channel": "stable",
     "extension_types": ["hosted_app"]
   },
   "app.linked_icons": {
     "channel": "dev",
@@ skipping 227 matching lines @@
   },
   "update_url": {
     "channel": "stable",
     "extension_types": "all"
   },
   "url_handlers": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   }
 }