REGRESSION(r212853): Comparisons to baseline no longer shows up

REGRESSION(r212853): Comparisons to baseline no longer shows up
https://bugs.webkit.org/show_bug.cgi?id=168863

Reviewed by Joseph Pecoraro.

The bug was caused by ChartStatusView's code not being updated to use TimeSeriesView's.
Updated the code to use TimeSeriesView's methods to fix the bug.

Also made InteractiveTimeSeriesChart's currentPoint to return a (TimeSeriesView, point, isLocked) tuple
to consolidate it with lockedIndicator() to work towards making the baseline data points selectable.

* browser-tests/time-series-chart-tests.js: Updated the test cases to use currentIndicator, and added
test cases for newly added lastPointInTimeRange.

* public/v3/components/chart-pane.js:
(ChartPane.prototype.serializeState): Updated to use currentIndicator.
(ChartPane.prototype._renderFilteringPopover): Ditto.

* public/v3/components/chart-status-view.js:
(ChartStatusView.prototype.updateStatusIfNeeded): Use currentIndicator for an interative time series.
Fixed the non-interactive chart's code path for TimeSeriesView.
(ChartStatusView.prototype._computeChartStatus): Modernized the code.
(ChartStatusView.prototype._findLastPointPriorToTime): Deleted. Replaced by TimeSeriesView's
lastPointInTimeRange.

* public/v3/components/interactive-time-series-chart.js:
(InteractiveTimeSeriesChart.prototype.currentIndicator):
(InteractiveTimeSeriesChart.prototype.moveLockedIndicatorWithNotification):
(InteractiveTimeSeriesChart.prototype._renderChartContent):
(InteractiveTimeSeriesChart):

* public/v3/models/time-series.js:
(TimeSeriesView.prototype.lastPointInTimeRange): Added.
(TimeSeriesView.prototype._reverse): Added. Traverses the view in the reverse order.
* unit-tests/time-series-tests.js:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@212997 268f45cc-cd09-0410-ab3c-d52691b4dbfc