New perf dashboard shouldn't always show outliners

New perf dashboard shouldn't always show outliners
https://bugs.webkit.org/show_bug.cgi?id=141445

Reviewed by Chris Dumez.

Use the simple moving average with an average difference envelope to compute the y-axis range to show
to avoid expanding it spuriously to show one off outlier.

* public/v2/app.js:
(App.Pane): Don't show the full y-axis range by default.
(App.Pane._computeChartData): Use the first strategies for the moving average and the enveloping if
one is not specified by the user but without showing them in the charts.
(App.Pane._computeMovingAverage): Takes moving average and enveloping strategies as arguments instead
of retrieving via chosenMovingAverageStrategy and chosenEnvelopingStrategy.

(App.ChartsController._parsePaneList): Added showFullYAxis as a query string argument to each pane.
(App.ChartsController._serializePaneList): Ditto.

* public/v2/chart-pane.css: Added a CSS rule for when y-axis is clickable.

* public/v2/index.html: Pass in showFullYAxis as an argument to the main interactive chart.

* public/v2/interactive-chart.js:
(App.InteractiveChartComponent._constructGraphIfPossible): Add an event listener on y-axis labels when
the chart is interactive so that toggle showFullYAxis. Also hide the moving average and/or the envelope
if they are not specified by the user (i.e. only used to adjust y-axis range).
(App.InteractiveChartComponent._updateDomain): Don't exit early if y-axis domains are different even if
x-axis domain remained the same. Without this change, the charts would never redraw.
(App.InteractiveChartComponent._minMaxForAllTimeSeries): Use the moving average instead of the current
time series to compute the y-axis range if showFullYAxis is false. When showFullYAxis is true, expand
y-axis all the way down to 0 or the minimum value in the current time series whichever is smaller.

* public/v2/js/statistics.js:
(Statistics.MovingAverageStrategies): Use a wider window in Simple Moving Average by default.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@179913 268f45cc-cd09-0410-ab3c-d52691b4dbfc