DevTools: Add support for adding source map to a script from the DevTools window.

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 40 matching lines @@
     this.sourceMapURL = sourceMapURL;
     this.hasSourceURL = hasSourceURL;
     /** @type {!Set.<!WebInspector.Script.Location>} */
     this._locations = new Set();
     /** @type {!Array.<!WebInspector.SourceMapping>} */
     this._sourceMappings = [];
 }
 
 WebInspector.Script.Events = {
     ScriptEdited: "ScriptEdited",
+    SourceMapURLAdded: "SourceMapURLAdded",
 }
 
 WebInspector.Script.snippetSourceURLPrefix = "snippets:///";
 
 WebInspector.Script.sourceURLRegex = /\n[\040\t]*\/\/[@#]\ssourceURL=\s*(\S*?)\s*$/mg;
 
 /**
  * @param {string} source
  * @return {string}
  */
@@ skipping 135 matching lines @@
     /**
      * @return {boolean}
      */
     isInlineScript: function()
     {
         var startsAtZero = !this.lineOffset && !this.columnOffset;
         return !!this.sourceURL && !startsAtZero;
     },
 
     /**
+     * @param {string} sourceMapURL
+     */
+    addSourceMapURL: function(sourceMapURL)
+    {
+        if (this.sourceMapURL)
+            return;
+        this.sourceMapURL = sourceMapURL;
+        this.dispatchEventToListeners(WebInspector.Script.Events.SourceMapURLAdded, this.sourceMapURL);
+    },
+
+    /**
      * @return {boolean}
      */
     isAnonymousScript: function()
     {
         return !this.sourceURL;
     },
 
     /**
      * @return {boolean}
      */
@@ skipping 95 matching lines @@
     },
 
     dispose: function()
     {
         WebInspector.LiveLocation.prototype.dispose.call(this);
         this._script._locations.remove(this);
     },
 
     __proto__: WebInspector.LiveLocation.prototype
 }