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

Source/devtools/front_end/devtools_app/InspectorFrontendHostImpl.js

Index: Source/devtools/front_end/devtools_app/InspectorFrontendHostImpl.js
diff --git a/Source/devtools/front_end/devtools_app/InspectorFrontendHostImpl.js b/Source/devtools/front_end/devtools_app/InspectorFrontendHostImpl.js
index 904416f9ca8b9cc550e62fbc1e28f5efdecb18e2..a8b66976fd5dec8b10bd4c967e6bbff4626a0195 100644
--- a/Source/devtools/front_end/devtools_app/InspectorFrontendHostImpl.js
+++ b/Source/devtools/front_end/devtools_app/InspectorFrontendHostImpl.js
@@ -104,6 +104,42 @@ WebInspector.InspectorFrontendHostImpl.prototype = {
 
     /**
      * @override
+     * @param {function(!Object<string, string>)} callback
+     */
+    getPreferences: function(callback)
+    {
+        DevToolsAPI.sendMessageToEmbedder("getPreferences", [], /** @type {function(?Object)} */ (callback));
+    },
+
+    /**
+     * @override
+     * @param {string} name
+     * @param {string} value
+     */
+    setPreference: function(name, value)
+    {
+        DevToolsAPI.sendMessageToEmbedder("setPreference", [name, value], null);
+    },
+
+    /**
+     * @override
+     * @param {string} name
+     */
+    removePreference: function(name)
+    {
+        DevToolsAPI.sendMessageToEmbedder("removePreference", [name], null);
+    },
+
+    /**
+     * @override
+     */
+    clearPreferences: function()
+    {
+        DevToolsAPI.sendMessageToEmbedder("clearPreferences", [], null);
+    },
+
+    /**
+     * @override
      * @param {string} origin
      * @param {string} script
      */