Support custom icon in search result.

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.
 
 // This features file defines permissions for extension APIs implemented
 // under src/chrome.
 // 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:
@@ skipping 524 matching lines @@
   },{
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "platform_app"],
     "location": "component"
   }],
   "launcherSearchProvider": {
     "channel": "dev",
     "extension_types": ["extension", "platform_app"],
     "platform": ["chromeos"],
     "whitelist": [
-      "A948368FC53BE437A55FEB414106E207925482F5"  // File Manager
+      "A948368FC53BE437A55FEB414106E207925482F5",  // File Manager
+      "5065C83E84321221675D20FBE4DC43C655CC8C6F"   // Test Extension

[Matt Giuca, 2015/04/30 01:34:09]

We do not globally whitelist test extensions. Instead, you can use switches to
temporarily whitelist the extension from within the test. See:

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/common/exte...

[yawano, 2015/05/01 06:09:55]

Acknowledged.

     ]
   },
   "location": [
     {
       "channel": "dev",
       "extension_types": [
         "extension", "legacy_packaged_app", "platform_app"
       ]
     },
     {
@@ skipping 441 matching lines @@
   },
   "webstorePrivate": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app", "hosted_app"],
     "whitelist": [
       "B44D08FD98F1523ED5837D78D0A606EA9D6206E5",  // Web Store
       "2653F6F6C39BC6EEBD36A09AFB92A19782FF7EB4"   // Enterprise Web Store
     ]
   }
 }