DevTools: introduce WI.UISourceCode.requestMetadata()

third_party/WebKit/Source/devtools/front_end/workspace/Workspace.js

 /*
  * Copyright (C) 2012 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 80 matching lines @@
      */
     type: function() { },
 
     /**
      * @return {string}
      */
     displayName: function() { },
 
     /**
      * @param {!WebInspector.UISourceCode} uiSourceCode
+     * @return {!Promise<?WebInspector.UISourceCodeMetadata>}
+     */
+    requestMetadata: function(uiSourceCode) { },
+
+    /**
+     * @param {!WebInspector.UISourceCode} uiSourceCode
      * @param {function(?string)} callback
      */
     requestFileContent: function(uiSourceCode, callback) { },
 
     /**
      * @return {boolean}
      */
     canSetFileContent: function() { },
 
     /**
@@ skipping 363 matching lines @@
         return this._hasResourceContentTrackingExtensions;
     },
 
     __proto__: WebInspector.Object.prototype
 }
 
 /**
  * @type {!WebInspector.Workspace}
  */
 WebInspector.workspace;