Initialize min/max record time to 0 instead of -1 or null

Source/devtools/front_end/timeline/TimelineTracingView.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.
  */
 
 /**
  * @constructor
  * @implements {WebInspector.TimelineModeView}
  * @implements {WebInspector.FlameChartDelegate}
@@ skipping 298 matching lines @@
          */
         this._timelineData = {
             entryLevels: [],
             entryTotalTimes: [],
             entryStartTimes: []
         };
 
         this._currentLevel = 0;
         this._headerTitles = {};
         this._minimumBoundary = this._timelineModelForMinimumBoundary.minimumRecordTime();
-        this._timeSpan = Math.max((this._model.maximumRecordTime() || 0) - this._minimumBoundary, 1000);
+        this._timeSpan = Math.max(this._model.maximumRecordTime() - this._minimumBoundary, 1000);
         var processes = this._model.sortedProcesses();
         for (var processIndex = 0; processIndex < processes.length; ++processIndex) {
             var process = processes[processIndex];
             this._appendHeaderRecord(process.name(), this._processHeaderRecord);
             var objectNames = process.sortedObjectNames();
             for (var objectNameIndex = 0; objectNameIndex < objectNames.length; ++objectNameIndex) {
                 this._appendHeaderRecord(WebInspector.UIString("Object %s", objectNames[objectNameIndex]), this._threadHeaderRecord);
                 var objects = process.objectsByName(objectNames[objectNameIndex]);
                 for (var objectIndex = 0; objectIndex < objects.length; ++objectIndex)
                     this._appendRecord(objects[objectIndex]);
@@ skipping 243 matching lines @@
     /**
      * @param {string} string
      * @return {string}
      */
     colorForString: function(string)
     {
         var hash = WebInspector.TraceViewPalette._stringHash(string);
         return this._palette[hash % this._palette.length];
     }
 };