Make RenderBox::scrollToOffset check for overflow

Make RenderBox::scrollToOffset check for overflow

This makes RenderBox::scrollToOffset check for overflow before
trying to scroll, making its behavior consistent with other
RenderBox scroll methods.

BUG=443479
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=187486

[ajuma, 2014-12-18 18:27:10]

ajuma@chromium.org changed reviewers:
+ skobes@chromium.org

[ajuma, 2014-12-18 18:27:19]

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

[ajuma, 2014-12-18 18:31:43]

Callers to RenderBox::scrollToOffset added in http://crrev.com/782793002 don't
check for overflow. An alternative fix would be to add the check to these
callers, but adding it in RenderBox::scrollToOffset seems to make more sense,
since other RenderBox scroll methods (e.g. setScrollLeft, setScrollTop,
scrollRectToVisible) also check for overflow rather than assuming it.

[skobes, 2014-12-18 18:44:54]

lgtm

[ajuma, 2014-12-18 18:45:51]

The CQ bit was checked by ajuma@chromium.org

[commit-bot: I haz the power, 2014-12-18 18:46:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/804343007/20001

[commit-bot: I haz the power, 2014-12-18 19:46:15]

Committed patchset #2 (id:20001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=187486