DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

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 345 matching lines @@
      * @return {boolean}
      */
     canJumpToEntry: function(entryIndex)
     {
         var record = this._records[entryIndex];
         return record.phase === WebInspector.TracingModel.Phase.SnapshotObject;
     },
 
     /**
      * @param {number} entryIndex
-     * @return {!string}
+     * @return {string}
      */
     entryColor: function(entryIndex)
     {
         var record = this._records[entryIndex];
         if (record.phase === WebInspector.TracingModel.Phase.SnapshotObject)
             return "rgb(20, 150, 20)";
         if (record === this._processHeaderRecord)
             return "#555";
         if (record === this._threadHeaderRecord)
             return "#777";
@@ skipping 43 matching lines @@
     /**
      * @return {number}
      */
     paddingLeft: function()
     {
         return 0;
     },
 
     /**
      * @param {number} entryIndex
-     * @return {!string}
+     * @return {string}
      */
     textColor: function(entryIndex)
     {
         return "white";
     },
 
     /**
      * @param {string} title
      * @param {!WebInspector.TracingModel.Event} record
      */
@@ skipping 106 matching lines @@
     /**
      * @param {string} string
      * @return {string}
      */
     colorForString: function(string)
     {
         var hash = WebInspector.TraceViewPalette._stringHash(string);
         return this._palette[hash % this._palette.length];
     }
 };