Modify the button bar style to have wider hit-area for arrow button.
commit8b0082a9afa470799c454932fc5f9881fe5c29e0
authormukai <mukai@chromium.org>
Wed, 19 Aug 2015 21:27:24 +0000 (19 14:27 -0700)
committerCommit bot <commit-bot@chromium.org>
Wed, 19 Aug 2015 21:28:10 +0000 (19 21:28 +0000)
treecee2d1149699daebd00ba53c7aa11fba70494702
parentcc872d7245629d05512c1f239a177ab8dfa23456
Modify the button bar style to have wider hit-area for arrow button.

As is reported in the bug, the arrow button width is too narrow.
This CL specifies its size to a square of kButtonSize, and
modifies some constants to keep the same visual alignment.

BUG=517974
R=yoshiki@chromium.org, dewittj@chromium.org
TEST=checked manually, verified graphical position doesn't change
  with screenshot comparison

Review URL: https://codereview.chromium.org/1287163007

Cr-Commit-Position: refs/heads/master@{#344320}
ui/message_center/views/message_center_button_bar.cc