[debug] [reland] Consistently use script from FrameMirror

src/inspector/debugger_script_externs.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @typedef {{
         type: string,
         object: !Object,
         name: (string|undefined),
         startLocation: (!RawLocation|undefined),
         endLocation: (!RawLocation|undefined)
@@ skipping 448 matching lines @@
 
 /**
  * @param {boolean=} ignoreNestedScopes
  * @return {!Array<!ScopeMirror>}
  */
 FrameMirror.prototype.allScopes = function(ignoreNestedScopes) {}
 
 /** @return {!FrameDetails} */
 FrameMirror.prototype.details = function() {}
 
+/** @return {!ScriptMirror} */
+FrameMirror.prototype.script = function() {}
+
 /**
  * @param {string} source
  * @param {boolean} disableBreak
  */
 FrameMirror.prototype.evaluate = function(source, disableBreak) {}
 
 FrameMirror.prototype.restart = function() {}
 
 /** @param {number} index */
 FrameMirror.prototype.scope = function(index) {}
@@ skipping 34 matching lines @@
 ScopeMirror.prototype.setVariableValue = function(name, newValue) {}
 
 /**
  * @interface
  * @extends {Mirror}
  */
 function ContextMirror() {}
 
 /** @return {string|undefined} */
 ContextMirror.prototype.data = function() {}