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

Source/devtools/front_end/timeline/TimelineModel.js

Index: Source/devtools/front_end/timeline/TimelineModel.js
diff --git a/Source/devtools/front_end/timeline/TimelineModel.js b/Source/devtools/front_end/timeline/TimelineModel.js
index 9449c2d1a72b51a748d90ea36b1caa852e782121..d99ec08f49e6ce85788c7b9deffb2b6827c9ed15 100644
--- a/Source/devtools/front_end/timeline/TimelineModel.js
+++ b/Source/devtools/front_end/timeline/TimelineModel.js
@@ -284,6 +284,14 @@ WebInspector.TimelineModel.prototype = {
     },
 
     /**
+     * @return {boolean}
+     */
+    isEmpty: function()
+    {
+        return this.minimumRecordTime() === 0 && this.maximumRecordTime() === 0;
+    },
+
+    /**
      * @param {!WebInspector.TimelineModel.Record} record
      */
     _updateBoundaries: function(record)