Web Inspector: Hide child rows for filtered tasks in the Rendering Frames data grid

Web Inspector: Hide child rows for filtered tasks in the Rendering Frames data grid
https://bugs.webkit.org/show_bug.cgi?id=147960

Reviewed by Timothy Hatcher.

* UserInterface/Models/RenderingFrameTimelineRecord.js:
(WebInspector.RenderingFrameTimelineRecord.taskTypeForTimelineRecord):
New static method for mapping TimelineRecords to rendering frame tasks.
(WebInspector.RenderingFrameTimelineRecord.prototype.durationForTask):
Refactored to use taskTypeForTimelineRecord.

* UserInterface/Views/TimelineSidebarPanel.js:
(WebInspector.TimelineSidebarPanel.prototype.matchTreeElementAgainstCustomFilters):
Task filtering is applied to children of the frame record only. Parent frame
record is hidden by default, and visible by virtue of having unfiltered children.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@188398 268f45cc-cd09-0410-ab3c-d52691b4dbfc