[MD Bookmarks] Add skeleton for Material Design Bookmarks

chrome/common/extensions/api/_api_features.json

 // Copyright 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 extension APIs 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.
 //
 // Note that specifying "web_page", "blessed_web_page", or "all" as a context
 // type will require manually updating chrome/renderer/resources/dispatcher.cc.
@@ skipping 94 matching lines @@
     "contexts": ["blessed_extension"]
   },
   "automation": {
     "dependencies": ["manifest:automation"],
     "contexts": ["blessed_extension"]
   },
   "autotestPrivate": {
     "dependencies": ["permission:autotestPrivate"],
     "contexts": ["blessed_extension"]
   },
-  "bookmarkManagerPrivate": {
+  "bookmarkManagerPrivate": [{
     "dependencies": ["permission:bookmarkManagerPrivate"],
     "contexts": ["blessed_extension"]
-  },
+  }, {
+    "channel": "stable",
+    "contexts": ["webui"],
+    "matches": [
+      "chrome://bookmarks/*"
+    ]
+  }],
   "bookmarks": {
     "dependencies": ["permission:bookmarks"],
     "contexts": ["blessed_extension"]
   },
   "bookmarks.export": {
     "whitelist": [
       "D5736E4B5CF695CB93A2FB57E4FDC6E5AFAB6FE2", // http://crbug.com/312900
       "D57DE394F36DC1C3220E7604C575D29C51A6C495", // http://crbug.com/319444
       "3F65507A3B39259B38C8173C6FFA3D12DF64CCE9"  // http://crbug.com/371562
     ]
@@ skipping 689 matching lines @@
     "internal": true,
     "channel": "stable",
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["api:tabs"],
     "contexts": ["blessed_extension"]
   }
 }