DevTools: migrate from external Maps to symbols in the bindings objects.

third_party/WebKit/Source/devtools/front_end/bindings/DefaultScriptMapping.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 25 matching lines @@
    * @param {!SDK.DebuggerModel} debuggerModel
    * @param {!Workspace.Workspace} workspace
    * @param {!Bindings.DebuggerWorkspaceBinding} debuggerWorkspaceBinding
    */
   constructor(debuggerModel, workspace, debuggerWorkspaceBinding) {
     this._debuggerModel = debuggerModel;
     this._debuggerWorkspaceBinding = debuggerWorkspaceBinding;
     var projectId = Bindings.DefaultScriptMapping.projectIdForTarget(debuggerModel.target());
     this._project = new Bindings.ContentProviderBasedProject(
         workspace, projectId, Workspace.projectTypes.Debugger, '', true /* isServiceProject */);
-    /** @type {!Map.<string, !Workspace.UISourceCode>} */
-    this._uiSourceCodeForScriptId = new Map();
-    /** @type {!Map.<!Workspace.UISourceCode, string>} */
-    this._scriptIdForUISourceCode = new Map();
     this._eventListeners =
         [debuggerModel.addEventListener(SDK.DebuggerModel.Events.GlobalObjectCleared, this._debuggerReset, this)];
   }
 
   /**
    * @param {!Workspace.UISourceCode} uiSourceCode
    * @return {?SDK.Script}
    */
   static scriptForUISourceCode(uiSourceCode) {
     return uiSourceCode[Bindings.DefaultScriptMapping._scriptSymbol] || null;
   }
 
   /**
    * @param {!SDK.Target} target
    * @return {string}
    */
   static projectIdForTarget(target) {
     return 'debugger:' + target.id();
   }
 
   /**
    * @override
    * @param {!SDK.DebuggerModel.Location} rawLocation
    * @return {!Workspace.UILocation}
    */
   rawLocationToUILocation(rawLocation) {
     var debuggerModelLocation = /** @type {!SDK.DebuggerModel.Location} */ (rawLocation);
     var script = debuggerModelLocation.script();
-    var uiSourceCode = this._uiSourceCodeForScriptId.get(script.scriptId);
+    var uiSourceCode = script[Bindings.DefaultScriptMapping._uiSourceCodeSymbol];
     var lineNumber = debuggerModelLocation.lineNumber - (script.isInlineScriptWithSourceURL() ? script.lineOffset : 0);
     var columnNumber = debuggerModelLocation.columnNumber || 0;
     if (script.isInlineScriptWithSourceURL() && !lineNumber && columnNumber)
       columnNumber -= script.columnOffset;
     return uiSourceCode.uiLocation(lineNumber, columnNumber);
   }
 
   /**
    * @override
    * @param {!Workspace.UISourceCode} uiSourceCode
    * @param {number} lineNumber
    * @param {number} columnNumber
    * @return {?SDK.DebuggerModel.Location}
    */
   uiLocationToRawLocation(uiSourceCode, lineNumber, columnNumber) {
-    var scriptId = this._scriptIdForUISourceCode.get(uiSourceCode);
-    var script = this._debuggerModel.scriptForId(scriptId);
+    var script = uiSourceCode[Bindings.DefaultScriptMapping._scriptSymbol];
     if (script.isInlineScriptWithSourceURL()) {
       return this._debuggerModel.createRawLocation(
           script, lineNumber + script.lineOffset, lineNumber ? columnNumber : columnNumber + script.columnOffset);
     }
     return this._debuggerModel.createRawLocation(script, lineNumber, columnNumber);
   }
 
   /**
    * @param {!SDK.Script} script
    */
   addScript(script) {
     var name = Common.ParsedURL.extractName(script.sourceURL);
     var url = 'debugger:///VM' + script.scriptId + (name ? ' ' + name : '');
 
     var uiSourceCode = this._project.createUISourceCode(url, Common.resourceTypes.Script);
     uiSourceCode[Bindings.DefaultScriptMapping._scriptSymbol] = script;
-    this._uiSourceCodeForScriptId.set(script.scriptId, uiSourceCode);
-    this._scriptIdForUISourceCode.set(uiSourceCode, script.scriptId);
+    script[Bindings.DefaultScriptMapping._uiSourceCodeSymbol] = uiSourceCode;
     this._project.addUISourceCodeWithProvider(uiSourceCode, script, null);
 
     this._debuggerWorkspaceBinding.setSourceMapping(this._debuggerModel.target(), uiSourceCode, this);
     this._debuggerWorkspaceBinding.pushSourceMapping(script, this);
   }
 
   /**
    * @override
    * @return {boolean}
    */
   isIdentity() {
     return true;
   }
 
   /**
    * @override
    * @param {!Workspace.UISourceCode} uiSourceCode
    * @param {number} lineNumber
    * @return {boolean}
    */
   uiLineHasMapping(uiSourceCode, lineNumber) {
     return true;
   }
 
   _debuggerReset() {
-    this._uiSourceCodeForScriptId.clear();
-    this._scriptIdForUISourceCode.clear();
     this._project.reset();
   }
 
   dispose() {
     Common.EventTarget.removeEventListeners(this._eventListeners);
     this._debuggerReset();
     this._project.dispose();
   }
 };
 
 Bindings.DefaultScriptMapping._scriptSymbol = Symbol('symbol');
+Bindings.DefaultScriptMapping._uiSourceCodeSymbol = Symbol('uiSourceCodeSymbol');