DevTools: move the "Capture *" checkboxes from timeline sidebar to the toolbar.

Source/devtools/front_end/timeline/TimelineModel.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 266 matching lines @@
 
     /**
      * @return {number}
      */
     maximumRecordTime: function()
     {
         return this._maximumRecordTime;
     },
 
     /**
+     * @return {boolean}
+     */
+    isEmpty: function()
+    {
+        return this.minimumRecordTime() === 0 && this.maximumRecordTime() === 0;
+    },
+
+    /**
      * @param {!WebInspector.TimelineModel.Record} record
      */
     _updateBoundaries: function(record)
     {
         var startTime = record.startTime();
         var endTime = record.endTime();
 
         if (!this._minimumRecordTime || startTime < this._minimumRecordTime)
             this._minimumRecordTime = startTime;
         if (endTime > this._maximumRecordTime)
@@ skipping 257 matching lines @@
         function recordTimestampComparator(a, b)
         {
             // Never return 0, as the merge function will squash identical entries.
             return a.startTime() < b.startTime() ? -1 : 1;
         }
         var result = this._backgroundRecordsBuffer.mergeOrdered(records, recordTimestampComparator);
         this._backgroundRecordsBuffer = [];
         return result;
     }
 }