ComponentBase should enqueue itself to render when it becomes connected

ComponentBase should enqueue itself to render when it becomes connected
https://bugs.webkit.org/show_bug.cgi?id=169905

Reviewed by Antti Koivisto.

When a component becomes connected to a document, enqueue itself to render automatically.
Also added the support for boolean attribute to ComponentBase.createElement.

* ReadMe.md: Added an instruction to raise the upload limit per r214065.
* browser-tests/component-base-tests.js: Added tests for the new behavior and createElement. Also moved
the tests related to enqueueToRenderOnResize out of defineElement tests.

* browser-tests/index.html:
(BrowsingContext.prototype.constructor): Override requestAnimationFrame so that the callback would be
involved immediately durign testing.

* public/v3/components/base.js:
(ComponentBase): Enqueue itself to render during construction if custom elements is not available.
(ComponentBase.defineElement):
(ComponentBase.defineElement.elementClass.prototype.connectedCallback): Enqueue itself to render when
the component's element became connected.
(ComponentBase.createElement): Use Array.isArray instead of instanceof to make it work with arrays made
in other realms (global objects) during testing. Added the support for boolean attributes. Setting an
attribute value to true would set the attribute, and setting it to false would not set the attribute.
(ComponentBase.useNativeCustomElements): Added. True iff window.customElements is defined.

* public/v3/components/chart-pane-base.js:
(ChartPaneBase.prototype.render): No longer need to call enqueueToRender on the commit log viewer.

* public/v3/components/commit-log-viewer.js:
(CommitLogViewer.prototype.render): No longer need to call enqueueToRender on the spinner icon.

* public/v3/models/time-series.js:
(TimeSeries): Made this a proper class declaration now that we don't include data.js after r213300.

* public/v3/pages/chart-pane.js:
(ChartPane.prototype._renderActionToolbar): No longer need to call enqueueToRender on the close icon.

* public/v3/pages/summary-page.js:
(SummaryPage.prototype._renderCell): No longer need to call enqueueToRender on the spinner icon.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@214280 268f45cc-cd09-0410-ab3c-d52691b4dbfc