HTMLPluginElement should use setNeedsCompositingUpdate()

HTMLPluginElement should use setNeedsCompositingUpdate()

HTMLPluginElement::loadPlugin was using scheduleSVGFilterLayerUpdateHack()
to update the compositing state of the LayoutEmbeddedObject. Instead we
can use the setNeedsCompositingUpdate() API which will cause only a
compositing update and skip the wasteful style recalc on the <embed> or
<object>.

I also moved the call to updateSelfPaintingLayer into
setNeedsCompositingUpdate since all callers of it actually want to do
that too.

After this the only user of scheduleSVGFilterLayerUpdateHack is actually
SVG filters.

R=ojan@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=200861

[esprehn, 2015-08-19 20:53:48]

The CQ bit was checked by esprehn@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2015-08-19 20:54:14]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1293533005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1293533005/1

[commit-bot: I haz the power, 2015-08-19 22:20:52]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-08-19 22:20:52]

Dry run: This issue passed the CQ dry run.

[esprehn, 2015-08-19 22:34:46]

esprehn@chromium.org changed reviewers:
+ pdr@chromium.org

[pdr., 2015-08-19 23:13:21]

The CQ bit was checked by pdr@chromium.org

[pdr., 2015-08-19 23:13:21]

lgtm

[commit-bot: I haz the power, 2015-08-20 00:00:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1293533005/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1293533005/1

[commit-bot: I haz the power, 2015-08-20 00:10:39]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=200861