Move synthetic gesture input to be aligned with BeginFrame.

Move synthetic gesture input to be aligned with BeginFrame.

The timing of synthetic events seems almost random. It is best to align
it with something that doesn't fluctuate. Android already rAF aligns its
synthetic input so do this for aura and mac as well.

Reland https://codereview.chromium.org/2372873003. It was reverted because
of a regression that was fixed in https://codereview.chromium.org/2385333002

BUG=646369
TBR=sadrul@chromium.org

Committed: https://crrev.com/7f7c8cc8b97dd0d5c9159d9e60c62efbc35e6b53
Cr-Commit-Position: refs/heads/master@{#424449}

[dtapuska, 2016-10-11 15:31:35]

The CQ bit was checked by dtapuska@chromium.org

[commit-bot: I haz the power, 2016-10-11 15:31:59]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-10-11 16:26:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-10-11 16:28:12]

Description was changed from

==========
Move synthetic gesture input to be aligned with BeginFrame.

The timing of synthetic events seems almost random. It is best to align
it with something that doesn't fluctuate. Android already rAF aligns its
synthetic input so do this for aura and mac as well.

Reland https://codereview.chromium.org/2372873003. It was reverted because
of a regression that was fixed in https://codereview.chromium.org/2385333002

BUG=646369
TBR=sadrul@chromium.org
==========

to

==========
Move synthetic gesture input to be aligned with BeginFrame.

The timing of synthetic events seems almost random. It is best to align
it with something that doesn't fluctuate. Android already rAF aligns its
synthetic input so do this for aura and mac as well.

Reland https://codereview.chromium.org/2372873003. It was reverted because
of a regression that was fixed in https://codereview.chromium.org/2385333002

BUG=646369
TBR=sadrul@chromium.org

Committed: https://crrev.com/7f7c8cc8b97dd0d5c9159d9e60c62efbc35e6b53
Cr-Commit-Position: refs/heads/master@{#424449}
==========

[commit-bot: I haz the power, 2016-10-11 16:28:13]

Patchset 1 (id:??) landed as
https://crrev.com/7f7c8cc8b97dd0d5c9159d9e60c62efbc35e6b53
Cr-Commit-Position: refs/heads/master@{#424449}