Opt out of composited scrolling with border radius.

Opt out of composited scrolling with border radius.

This currently causes correctness and memory issues due to the way the
compositor handles masking out the corners. Let's punt on this for now.

BUG=409984, 365828
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=181484

[Ian Vollick, 2014-09-05 14:31:40]

vollick@chromium.org changed reviewers:
+ hartmanng@chromium.org

[hartmanng, 2014-09-05 14:32:54]

lgtm

[Ian Vollick, 2014-09-05 14:33:14]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2014-09-05 14:33:48]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vollick@chromium.org/544183002/1

[commit-bot: I haz the power, 2014-09-05 15:34:56]

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

[commit-bot: I haz the power, 2014-09-05 15:34:57]

Try jobs failed on following builders:
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/2...)

[Ian Vollick, 2014-09-05 16:46:21]

On 2014/09/05 15:34:57, I haz the power (commit-bot) wrote:
> Try jobs failed on following builders:
>   linux_blink_rel on tryserver.blink
>
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/2...)

Glenn, some of the scrolling+border-radius expectations needed to be updated.
slgty?

[hartmanng, 2014-09-05 16:49:57]

Yeah, those tests were testing the previous partially-broken implementation (as
per http://crbug.com/365828), where scroll children could leak outside of the
border radius. slgtm

[Ian Vollick, 2014-09-05 16:53:52]

The CQ bit was checked by vollick@chromium.org

[commit-bot: I haz the power, 2014-09-05 16:54:30]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vollick@chromium.org/544183002/20001

[commit-bot: I haz the power, 2014-09-05 23:05:17]

Committed patchset #2 (id:20001) as 181484