DevTools: promisify ContentProvider.requestContent and all its clients.

third_party/WebKit/Source/devtools/front_end/bindings/ResourceScriptMapping.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 406 matching lines @@
     /**
      * @return {boolean}
      */
     isMergingToVM: function()
     {
         return this._isMergingToVM;
     },
 
     checkMapping: function()
     {
-        if (!this._script)
+        if (!this._script || typeof this._scriptSource !== "undefined") {
+            this._mappingCheckedForTest();
             return;
-        if (typeof this._scriptSource !== "undefined")
-            return;
-        this._script.requestContent(callback.bind(this));
+        }
+        this._script.requestContent().then(callback.bind(this));
 
         /**
          * @param {?string} source
          * @this {WebInspector.ResourceScriptFile}
          */
         function callback(source)
         {
             this._scriptSource = source;
             this._update();
+            this._mappingCheckedForTest();
         }
     },
 
+    _mappingCheckedForTest: function() { },
+
     /**
      * @return {?WebInspector.Target}
      */
     target: function()
     {
         if (!this._script)
             return null;
         return this._script.target();
     },
 
@@ skipping 16 matching lines @@
     /**
      * @return {boolean}
      */
     hasSourceMapURL: function()
     {
         return this._script && !!this._script.sourceMapURL;
     },
 
     __proto__: WebInspector.Object.prototype
 }