API proposal for chrome.app.window to intercept all keys.

extensions/common/api/_permission_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 permissions for extension APIs implemented
 // under src/extensions.
 
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
@@ skipping 45 matching lines @@
     {
       "channel": "stable",
       "extension_types": ["extension"],
       "whitelist": [
         "06BE211D5F014BAB34BC22D9DDA09C63A81D828E",  // http://crbug.com/425539
         "F94EE6AB36D6C6588670B2B01EB65212D9C64E33",
         "B9EF10DDFEA11EF77873CC5009809E5037FC4C7A"   // http://crbug.com/435380
       ]
     }
   ],
+  "app.window.interceptAllKeys": {
+    "channel": "dev",
+    "extension_types": ["platform_app"]
+  },
   "app.window.shape": {
     "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "app.window.ime": [
     {
        "channel": "stable",
        "extension_types": ["extension"],
        "platforms": ["chromeos"],
        "whitelist": [
@@ skipping 268 matching lines @@
     "extension_types": ["extension", "legacy_packaged_app"]
      }
   ],
   "webRequestBlocking": [
     {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
     }
   ]
 }