Get rid of clampScrollOffset and make maximumScrollPosition sane.

Get rid of clampScrollOffset and make maximumScrollPosition sane.

This also gets rid of a bug in clampScrollOffset that sometimes caused it to use a maximum offset that was one pixel too small, so a few tests need to be rebaselined.

BUG=492871
R=skobes@chromium.org

Committed: https://crrev.com/c5b90a1590f9d7d96eec5f85a9dc018ddf5fb295
git-svn-id: svn://svn.chromium.org/blink/trunk@201983 bbb929c8-8fbe-4397-9dbb-9b2b20218538

[szager1, 2015-07-09 19:11:33]

The CQ bit was checked by szager@chromium.org

[szager1, 2015-07-09 19:11:36]

The CQ bit was unchecked by szager@chromium.org

[skobes, 2015-07-09 19:15:07]

lgtm

[szager1, 2015-07-09 19:24:12]

Slight tweak, PTAL: toScrollOffset is used everywhere in DPLScrollableArea,
rather than mixing with setScrollPosition.

[skobes, 2015-07-09 19:25:24]

still lgtm

[szager1, 2015-07-10 23:26:03]

The CQ bit was checked by szager@chromium.org

[szager1, 2015-07-10 23:26:03]

The patchset sent to the CQ was uploaded after l-g-t-m from skobes@chromium.org
Link to the patchset: https://codereview.chromium.org/1223173006/#ps40001
(title: "Add scrollToPosition")

[commit-bot: I haz the power, 2015-07-10 23:26:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1223173006/40001

[commit-bot: I haz the power, 2015-07-11 00:42:13]

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

[commit-bot: I haz the power, 2015-07-11 00:42:14]

Try jobs failed on following builders:
  mac_blink_rel on tryserver.blink (JOB_FAILED,
http://build.chromium.org/p/tryserver.blink/builders/mac_blink_rel/builds/62545)

[szager1, 2015-09-09 15:58:34]

The CQ bit was checked by szager@chromium.org

[szager1, 2015-09-09 15:58:34]

The patchset sent to the CQ was uploaded after l-g-t-m from skobes@chromium.org
Link to the patchset: https://codereview.chromium.org/1223173006/#ps120001
(title: "Revert changes to Element::clientWidth, etc.")

[commit-bot: I haz the power, 2015-09-09 15:58:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1223173006/120001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1223173006/120001

[commit-bot: I haz the power, 2015-09-09 16:04:23]

Committed patchset #7 (id:120001) as
https://src.chromium.org/viewvc/blink?view=rev&revision=201983

[commit-bot: I haz the power, 2015-09-23 12:00:21]

Patchset 7 (id:??) landed as
https://crrev.com/c5b90a1590f9d7d96eec5f85a9dc018ddf5fb295