Show colored segments for available resource timing information. A few considerations:
1) Colors should be distinct from those used by other timeline record bars, since they are displayed in the OverviewTimelineView.
2) Don't show segments that fall below a minimum size, based on the zoom level. Minimum size should be TimelineRecordBar.MinimumWidthPixels * secondsPerPixel.
3) Segments that aren't shown should be absorbed by adjacent segments.
4) Always show the "response" segment.
For now let's use a blue palette for all segments, since blue is associated with Network data. The response segment should not change from its current color. In the future we might want to change the palette for accessibility reasons.
Un-assigning since the bug has been inactive for over three months.
Folding this back into the parent.
*** This bug has been marked as a duplicate of bug 147897 ***