[NOT FOR REVIEW] extensions-wm: Add experimental extension API for window management.

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": "dev",
     "extension_types": ["extension", "packaged_app"],
     "min_manifest_version": 2
   },
@@ skipping 308 matching lines @@
       "afchcafgojfnemjkcbhfekplkmjaldaa"   // Enterprise Web Store
     ]
   },
   "webRequest": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "packaged_app"]
+  },
+  "wm": {
+    "channel": "dev",

[Aaron Boodman, 2012/08/21 21:13:43]

"trunk" for now.

+    "extension_types": ["extension", "packaged_app", "platform_app"]
   }
 }