DevTools: add range checks while adding console message to the SourceFrame

As the liveEdit happens, we ideally need to update uiLocation of the error
to the actual new script. However, this is a tedious task to do, so we
would simply defend againt exceptions thrown in UI.

R=pfeldman
NOTRY=true

Review URL: https://codereview.chromium.org/1312523002

git-svn-id: svn://svn.chromium.org/blink/trunk@201047 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/source_frame/SourceFrame.js

@@ -859,7 +859,9 @@ WebInspector.SourceFrame.RowMessageBucket.prototype = {
      */
     _updateWavePosition: function(lineNumber, columnNumber)
     {
+        lineNumber = Math.min(lineNumber, this._textEditor.linesCount - 1);
         var lineText = this._textEditor.line(lineNumber);
+        columnNumber = Math.min(columnNumber, lineText.length);
         var lineIndent = WebInspector.TextUtils.lineIndent(lineText).length;
         var base = this._textEditor.cursorPositionToCoordinates(lineNumber, 0);