DevTools: promisify ContentProvider.requestContent and all its clients.

third_party/WebKit/Source/devtools/front_end/sdk/Script.js

 /*
  * Copyright (C) 2008 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 120 matching lines @@
      * @override
      * @return {!WebInspector.ResourceType}
      */
     contentType: function()
     {
         return WebInspector.resourceTypes.Script;
     },
 
     /**
      * @override
-     * @param {function(?string)} callback
+     * @return {!Promise<?string>}
      */
-    requestContent: function(callback)
+    requestContent: function()
     {
-        if (this._source) {
-            callback(this._source);
-            return;
-        }
+        if (this._source)
+            return Promise.resolve(this._source);
+        if (!this.scriptId)
+            return Promise.resolve(/** @type {?string} */(""));
+
+        var callback;
+        var promise = new Promise(fulfill => callback = fulfill);
+        this.target().debuggerAgent().getScriptSource(this.scriptId, didGetScriptSource.bind(this));
+        return promise;
 
         /**
          * @this {WebInspector.Script}
          * @param {?Protocol.Error} error
          * @param {string} source
          */
         function didGetScriptSource(error, source)
         {
             this._source = WebInspector.Script._trimSourceURLComment(error ? "" : source);
             callback(this._source);
         }
-        if (this.scriptId) {
-            // Script failed to parse.
-            this.target().debuggerAgent().getScriptSource(this.scriptId, didGetScriptSource.bind(this));
-        } else
-            callback("");
     },
 
     /**
      * @override
      * @param {string} query
      * @param {boolean} caseSensitive
      * @param {boolean} isRegex
      * @param {function(!Array.<!DebuggerAgent.SearchMatch>)} callback
      */
     searchInContent: function(query, caseSensitive, isRegex, callback)
@@ skipping 109 matching lines @@
     /**
      * @return {boolean}
      */
     isInlineScriptWithSourceURL: function()
     {
         return !!this.hasSourceURL && this.isInlineScript();
     },
 
     __proto__: WebInspector.SDKObject.prototype
 }