WebKitPerfMonitor: Sometimes text inside panes overlap

WebKitPerfMonitor: Sometimes text inside panes overlap
https://bugs.webkit.org/show_bug.cgi?id=130956

Reviewed by Gyuyoung Kim.

Revamped the pane UI. Now build info uses table element instead of plane text with BRs. The computed status of
the latest result against baseline/target such as "3% until target" is now shown above the current value. This
reduces the total height of the pane and fits more information per screen capita on the dashboard.

* public/index.html: Updated and added a bunch of CSS rules for the new look.
(.computeStatus): Don't append the build info here. The build info is constructed as a separate table now.
(.createSummaryRowMarkup): Use th instead of td for "Current", "Baseline", and "Target" in the summary table.
(.buildLabelWithLinks): Construct table rows instead of br separated lines of text. This streamlines the look
of the build info shown in a chart pane and a tooltip.
(Chart): Made .status a table.
(Chart.populate): Prepend status.text, which contains text such as "3% until target", into the summary rows
right above "Current" value, and populate .status with buildLabelWithLinks manually instead of status.text
now that status.text no longer contains it.
(Chart..showTooltipWithResults):  Wrap buildLabelWithLinks with a table element.

* public/js/helper-classes.js:
(TestBuild.formattedRevisions): Don't include repository names in labels since repository names are now added
by buildLabelWithLinks inside th elements. Also place spaces around '-' between two different OS X versions.
e.g. "OS X 10.8 - OS X 10.9" instead of "OS X 10.8-OS X 10.9".
(PerfTestRuns): Use "/s" for "runs/s" and "B" for "bytes" to make text shorter in .status and .summaryTable.
(PerfTestRuns..computeScalingFactorIfNeeded): Avoid placing a space between 'M' and a unit starting with a
capital letter; e.g. "MB" instead of "M B".

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@166479 268f45cc-cd09-0410-ab3c-d52691b4dbfc