DevTools: gray out linenumbers for the unmapped source code lines

third_party/WebKit/Source/devtools/front_end/sources/JavaScriptSourceFrame.js

 /*
  * Copyright (C) 2011 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 1100 matching lines @@
     },
 
     /**
      * @param {number} lineNumber
      * @param {number} columnNumber
      * @param {string} condition
      * @param {boolean} enabled
      */
     _setBreakpoint: function(lineNumber, columnNumber, condition, enabled)
     {
+        if (!WebInspector.debuggerWorkspaceBinding.uiLineHasMapping(this.uiSourceCode(), lineNumber))
+            return;
+
         this._breakpointManager.setBreakpoint(this.uiSourceCode(), lineNumber, columnNumber, condition, enabled);
     },
 
     dispose: function()
     {
         this._breakpointManager.removeEventListener(WebInspector.BreakpointManager.Events.BreakpointAdded, this._breakpointAdded, this);
         this._breakpointManager.removeEventListener(WebInspector.BreakpointManager.Events.BreakpointRemoved, this._breakpointRemoved, this);
         this.uiSourceCode().removeEventListener(WebInspector.UISourceCode.Events.SourceMappingChanged, this._onSourceMappingChanged, this);
         this.uiSourceCode().removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyChanged, this._workingCopyChanged, this);
         this.uiSourceCode().removeEventListener(WebInspector.UISourceCode.Events.WorkingCopyCommitted, this._workingCopyCommitted, this);
         this.uiSourceCode().removeEventListener(WebInspector.UISourceCode.Events.TitleChanged, this._showBlackboxInfobarIfNeeded, this);
         WebInspector.moduleSetting("skipStackFramesPattern").removeChangeListener(this._showBlackboxInfobarIfNeeded, this);
         WebInspector.moduleSetting("skipContentScripts").removeChangeListener(this._showBlackboxInfobarIfNeeded, this);
         WebInspector.UISourceCodeFrame.prototype.dispose.call(this);
     },
 
     __proto__: WebInspector.UISourceCodeFrame.prototype
 }