DevTools: Throttle file system refreshes on focus.

Source/devtools/front_end/sdk/FileSystemWorkspaceBinding.js

 /*
  * Copyright (C) 2013 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 463 matching lines @@
         return WebInspector.resourceTypes.Other;
     },
 
     populate: function()
     {
         this._fileSystem.requestFilesRecursive("", this._addFile.bind(this));
     },
 
     /**
      * @param {string} path
+     * @param {function()=} callback
      */
-    refresh: function(path)
+    refresh: function(path, callback)
     {
-        this._fileSystem.requestFilesRecursive(path, this._addFile.bind(this));
+        this._fileSystem.requestFilesRecursive(path, this._addFile.bind(this), callback);
     },
 
     /**
      * @param {string} path
      */
     excludeFolder: function(path)
     {
         this._fileSystemWorkspaceBinding._isolatedFileSystemManager.mapping().addExcludedFolder(this._fileSystem.path(), path);
     },
 
@@ skipping 81 matching lines @@
     dispose: function()
     {
         this._workspace.removeProject(this._projectId);
     }
 }
 
 /**
  * @type {!WebInspector.FileSystemWorkspaceBinding}
  */
 WebInspector.fileSystemWorkspaceBinding;