Revert of Revert of DevTools: allow storing devtools preferences on the browser side. [blink]

Source/devtools/front_end/host/InspectorFrontendHost.js

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 189 matching lines @@
 
     /**
      * @param {string} url
      * @param {string} headers
      * @param {number} streamId
      * @param {function(!InspectorFrontendHostAPI.LoadNetworkResourceResult)} callback
      */
     loadNetworkResource: function(url, headers, streamId, callback) { },
 
     /**
+     * @param {function(!Object<string, string>)} callback
+     */
+    getPreferences: function(callback) { },
+
+    /**
+     * @param {string} name
+     * @param {string} value
+     */
+    setPreference: function(name, value) { },
+
+    /**
+     * @param {string} name
+     */
+    removePreference: function(name) { },
+
+    clearPreferences: function() { },
+
+    /**
      * @param {!FileSystem} fileSystem
      */
     upgradeDraggedFileSystemPermissions: function(fileSystem) { },
 
     /**
      * @return {string}
      */
     platform: function() { },
 
     /**
@@ skipping 274 matching lines @@
      * @param {string} headers
      * @param {number} streamId
      * @param {function(!InspectorFrontendHostAPI.LoadNetworkResourceResult)} callback
      */
     loadNetworkResource: function(url, headers, streamId, callback)
     {
         callback({statusCode : 404});
     },
 
     /**
+     * @override
+     * @param {function(!Object<string, string>)} callback
+     */
+    getPreferences: function(callback)
+    {
+        var prefs = {};
+        for (var name in window.localStorage)
+            prefs[name] = window.localStorage[name];
+        callback(prefs);
+    },
+
+    /**
+     * @override
+     * @param {string} name
+     * @param {string} value
+     */
+    setPreference: function(name, value)
+    {
+        window.localStorage[name] = value;
+    },
+
+    /**
+     * @override
+     * @param {string} name
+     */
+    removePreference: function(name)
+    {
+        delete window.localStorage[name];
+    },
+
+    /**
+     * @override
+     */
+    clearPreferences: function()
+    {
+        window.localStorage.clear();
+    },
+
+    /**
      * @override
      * @param {!FileSystem} fileSystem
      */
     upgradeDraggedFileSystemPermissions: function(fileSystem)
     {
     },
 
     /**
      * @override
      * @param {number} requestId
@@ skipping 199 matching lines @@
     // so the host instance should not initialized there.
     initializeInspectorFrontendHost();
     window.InspectorFrontendAPI = new InspectorFrontendAPIImpl();
     if (!window.DevToolsHost) {
         WebInspector.setLocalizationPlatform(InspectorFrontendHost.platform());
     } else {
         WebInspector.setLocalizationPlatform(DevToolsHost.platform());
     }
 
 })();