Draw nicer arrows when the scrollbar buttons are not square.

Draw nicer arrows when the scrollbar buttons are not square.

Before they would look squished or messed up, but with this patch
their bounding box is always square so we'll get the nice pixel pyramids
that we want. This shouldn't change anything visually for the normal
square scrollbar buttons.

BUG=614297
Review-Url: https://codereview.chromium.org/2009733002
Cr-Commit-Position: refs/heads/master@{#399626}
(cherry picked from commit 91cbc6d7c2f02771ee3640a4b2f3376029b3bab0)

Committed: https://chromium.googlesource.com/chromium/src/+/cf604e6b3f7b8c67b3c1d0c7dbe83a3c174fd21e

[Bret, 2016-06-17 18:49:55]

Description was changed from

==========
Draw nicer arrows when the scrollbar buttons are not square.

Before they would look squished or messed up, but with this patch
their bounding box is always square so we'll get the nice pixel pyramids
that we want. This shouldn't change anything visually for the normal
square scrollbar buttons.

BUG=614297

Review-Url: https://codereview.chromium.org/2009733002
Cr-Commit-Position: refs/heads/master@{#399626}
(cherry picked from commit 91cbc6d7c2f02771ee3640a4b2f3376029b3bab0)
==========

to

==========
Draw nicer arrows when the scrollbar buttons are not square.

Before they would look squished or messed up, but with this patch
their bounding box is always square so we'll get the nice pixel pyramids
that we want. This shouldn't change anything visually for the normal
square scrollbar buttons.

BUG=614297

Review-Url: https://codereview.chromium.org/2009733002
Cr-Commit-Position: refs/heads/master@{#399626}
(cherry picked from commit 91cbc6d7c2f02771ee3640a4b2f3376029b3bab0)

Committed:
https://chromium.googlesource.com/chromium/src/+/cf604e6b3f7b8c67b3c1d0c7dbe8...
==========

[Bret, 2016-06-17 18:49:57]

Committed patchset #1 (id:1) manually as
cf604e6b3f7b8c67b3c1d0c7dbe83a3c174fd21e.