DevTools: Make UISourceCode Target-agnostic

Source/devtools/front_end/sdk/LiveEditSupport.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 31 matching lines @@
     this._debuggerWorkspaceBinding = debuggerWorkspaceBinding;
     this._projectId = "liveedit:" + target.id();
     this._projectDelegate = new WebInspector.DebuggerProjectDelegate(workspace, this._projectId, WebInspector.projectTypes.LiveEdit);
     target.debuggerModel.addEventListener(WebInspector.DebuggerModel.Events.GlobalObjectCleared, this._debuggerReset, this);
     this._debuggerReset();
 }
 
 WebInspector.LiveEditSupport.prototype = {
     /**
      * @param {!WebInspector.UISourceCode} uiSourceCode
-     * @return {!WebInspector.UISourceCode}
+     * @return {?WebInspector.UISourceCode}
      */
     uiSourceCodeForLiveEdit: function(uiSourceCode)
     {
         var debuggerModelLocation = this._debuggerWorkspaceBinding.uiLocationToRawLocation(this.target(), uiSourceCode, 0, 0);
+        if (!debuggerModelLocation)
+            return null;
         var uiLocation = this._debuggerWorkspaceBinding.rawLocationToUILocation(debuggerModelLocation);
 
         // FIXME: Support live editing of scripts mapped to some file.
         if (uiLocation.uiSourceCode !== uiSourceCode)
             return uiLocation.uiSourceCode;
 
         var script = debuggerModelLocation.script();
         if (this._uiSourceCodeForScriptId[script.scriptId])
             return this._uiSourceCodeForScriptId[script.scriptId];
 
@@ skipping 82 matching lines @@
         WebInspector.console.error(message);
     } else {
         WebInspector.console.addMessage(WebInspector.UIString("Unknown LiveEdit error: %s; %s", JSON.stringify(errorData), error), warningLevel);
     }
 }
 
 WebInspector.LiveEditSupport.logSuccess = function()
 {
     WebInspector.console.log(WebInspector.UIString("Recompilation and update succeeded."));
 }