DevTools: make debugger's rawLocationToUILocation return nullable type

third_party/WebKit/Source/devtools/front_end/bindings/DebuggerWorkspaceBinding.js

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  * @implements {SDK.SDKModelObserver<!SDK.DebuggerModel>}
  */
 Bindings.DebuggerWorkspaceBinding = class {
   /**
    * @param {!SDK.TargetManager} targetManager
@@ skipping 90 matching lines @@
       return null;
     var debuggerModel = location.debuggerModel;
     this._ensureInfoForScript(script);
     var liveLocation = this.createLiveLocation(location, updateDelegate, locationPool);
     this._registerCallFrameLiveLocation(debuggerModel, liveLocation);
     return liveLocation;
   }
 
   /**
    * @param {!SDK.DebuggerModel.Location} rawLocation
-   * @return {!Workspace.UILocation}
+   * @return {?Workspace.UILocation}
    */
   rawLocationToUILocation(rawLocation) {
     for (var i = 0; i < this._sourceMappings.length; ++i) {
       var uiLocation = this._sourceMappings[i].rawLocationToUILocation(rawLocation);
       if (uiLocation)
         return uiLocation;
     }
     var modelData = this._debuggerModelToData.get(rawLocation.debuggerModel);
     return modelData._rawLocationToUILocation(rawLocation);
   }
@@ skipping 32 matching lines @@
   }
 
   /**
    * @param {!Workspace.UILocation} uiLocation
    * @return {!Workspace.UILocation}
    */
   normalizeUILocation(uiLocation) {
     var rawLocation =
         this.uiLocationToRawLocation(uiLocation.uiSourceCode, uiLocation.lineNumber, uiLocation.columnNumber);
     if (rawLocation)
-      return this.rawLocationToUILocation(rawLocation);
+      return this.rawLocationToUILocation(rawLocation) || uiLocation;
     return uiLocation;
   }
 
   /**
    * @param {!Workspace.UISourceCode} uiSourceCode
    * @param {!SDK.DebuggerModel} debuggerModel
    * @return {?Bindings.ResourceScriptFile}
    */
   scriptFile(uiSourceCode, debuggerModel) {
     var modelData = this._debuggerModelToData.get(debuggerModel);
@@ skipping 116 matching lines @@
       debuggerModel.addEventListener(SDK.DebuggerModel.Events.ParsedScriptSource, this._parsedScriptSource, this),
       debuggerModel.addEventListener(
           SDK.DebuggerModel.Events.FailedToParseScriptSource, this._parsedScriptSource, this),
       debuggerModel.addEventListener(
           SDK.DebuggerModel.Events.DiscardedAnonymousScriptSource, this._discardedScriptSource, this)
     ];
   }
 
   /**
    * @param {!SDK.DebuggerModel.Location} rawLocation
-   * @return {!Workspace.UILocation}
+   * @return {?Workspace.UILocation}
    */
   _rawLocationToUILocation(rawLocation) {
     var uiLocation = null;
     uiLocation = uiLocation || this._compilerMapping.rawLocationToUILocation(rawLocation);
     uiLocation = uiLocation || this._resourceMapping.rawLocationToUILocation(rawLocation);
     uiLocation = uiLocation || this._defaultMapping.rawLocationToUILocation(rawLocation);
-    // DefaultMapping ensures uiLocation for every rawLocation.
-    console.assert(uiLocation);
     return /** @type {!Workspace.UILocation} */ (uiLocation);
   }
 
   /**
    * @param {!Workspace.UISourceCode} uiSourceCode
    * @param {number} lineNumber
    * @param {number} columnNumber
    * @return {?SDK.DebuggerModel.Location}
    */
   _uiLocationToRawLocation(uiSourceCode, lineNumber, columnNumber) {
@@ skipping 92 matching lines @@
    */
   constructor(script, rawLocation, binding, updateDelegate, locationPool) {
     super(updateDelegate, locationPool);
     this._script = script;
     this._rawLocation = rawLocation;
     this._binding = binding;
   }
 
   /**
    * @override
-   * @return {!Workspace.UILocation}
+   * @return {?Workspace.UILocation}
    */
   uiLocation() {
     var debuggerModelLocation = this._rawLocation;
     return this._binding.rawLocationToUILocation(debuggerModelLocation);
   }
 
   /**
    * @override
    */
   dispose() {
@@ skipping 26 matching lines @@
     this._updateScheduled = true;
     /** @type {!Set<!Bindings.LiveLocation>} */
     this._locations = new Set();
     for (var location of rawLocations)
       this._locations.add(binding.createLiveLocation(location, this._scheduleUpdate.bind(this), locationPool));
     this._updateLocation();
   }
 
   /**
    * @override
-   * @return {!Workspace.UILocation}
+   * @return {?Workspace.UILocation}
    */
   uiLocation() {
     return this._current.uiLocation();
   }
 
   /**
    * @override
    * @return {boolean}
    */
   isBlackboxed() {
@@ skipping 47 matching lines @@
    * @param {number} columnNumber
    * @return {?SDK.DebuggerModel.Location}
    */
   uiLocationToRawLocation(uiSourceCode, lineNumber, columnNumber) {},
 };
 
 /**
  * @type {!Bindings.DebuggerWorkspaceBinding}
  */
 Bindings.debuggerWorkspaceBinding;