Be consistent about writing modes in boundingBoxForCompositingOverlapTest().

Be consistent about writing modes in boundingBoxForCompositingOverlapTest().

Always use "physical" rectangles (i.e. flip for writing-mode). This is what
boundingBoxForCompositing() already uses.

BUG=423372
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183694

[mstensho (USE GERRIT), 2014-10-14 15:00:59]

mstensho@opera.com changed reviewers:
+ chrishtr@chromium.org

[chrishtr, 2014-10-14 16:49:28]

The CQ bit was checked by chrishtr@chromium.org

[chrishtr, 2014-10-14 16:49:29]

lgtm

[commit-bot: I haz the power, 2014-10-14 16:50:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/653973002/1

[commit-bot: I haz the power, 2014-10-14 18:47:03]

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

[commit-bot: I haz the power, 2014-10-14 18:47:04]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/31748)

[mstensho (USE GERRIT), 2014-10-14 19:01:43]

The CQ bit was checked by mstensho@opera.com

[commit-bot: I haz the power, 2014-10-14 19:01:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/653973002/1

[commit-bot: I haz the power, 2014-10-14 19:57:43]

Committed patchset #1 (id:1) as 183694