DevTools: introduce goto-column functionality

Source/devtools/front_end/CodeMirrorTextEditor.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 788 matching lines @@
         if (widget)
             this._codeMirror.removeLineWidget(widget);
     },
 
     /**
      * @param {number} lineNumber
      * @param {number=} columnNumber
      */
     highlightPosition: function(lineNumber, columnNumber)
     {
-        if (lineNumber < 0)
-            return;
-        lineNumber = Math.min(lineNumber, this._codeMirror.lineCount() - 1);
-        if (typeof columnNumber !== "number" || columnNumber < 0 || columnNumber > this._codeMirror.getLine(lineNumber).length)
+        lineNumber = Number.constrain(lineNumber, 0, this._codeMirror.lineCount() - 1);
+        if (typeof columnNumber !== "number")
             columnNumber = 0;
+        columnNumber = Number.constrain(columnNumber, 0, this._codeMirror.getLine(lineNumber).length);
 
         this.clearPositionHighlight();
         this._highlightedLine = this._codeMirror.getLineHandle(lineNumber);
         if (!this._highlightedLine)
           return;
         this.revealLine(lineNumber);
         this._codeMirror.addLineClass(this._highlightedLine, null, "cm-highlight");
         this._clearHighlightTimeout = setTimeout(this.clearPositionHighlight.bind(this), 2000);
         if (!this.readOnly())
             this.setSelection(WebInspector.TextRange.createFromLocation(lineNumber, columnNumber));
@@ skipping 886 matching lines @@
     function tokenOverride(superToken, stream, state)
     {
         var token = superToken(stream, state);
         return token ? tokenPrefix + token : token;
     }
 }
 
 WebInspector.CodeMirrorTextEditor._overrideModeWithPrefixedTokens("css", "css-");
 WebInspector.CodeMirrorTextEditor._overrideModeWithPrefixedTokens("javascript", "js-");
 WebInspector.CodeMirrorTextEditor._overrideModeWithPrefixedTokens("xml", "xml-");