mac: Don't set background color from a frame until frame is displayed

mac: Don't set background color from a frame until frame is displayed

The first frame for dark-themed new tab pages still has a background
color of white, even though the frame's content is all black tiles.

Before this patch, we would set the background color to white, and then
later put up the black tiles in front, resulting in a white flash.

This updates all of those parts atomically in the same CATransaction.

BUG=470669
Review-Url: https://codereview.chromium.org/2866983002
Cr-Commit-Position: refs/heads/master@{#469919}
Committed: https://chromium.googlesource.com/chromium/src/+/cd8d494cec6d51ecddcb7e3ac09eb8661212e4f5

[ccameron, 2017-05-07 21:24:40]

ccameron@chromium.org changed reviewers:
+ avi@chromium.org

[ccameron, 2017-05-07 21:24:40]

Sorry, last one of these, promise!

[Avi (use Gerrit), 2017-05-08 01:30:17]

lgtm

[ccameron, 2017-05-08 07:22:01]

Thanks!

[ccameron, 2017-05-08 07:22:06]

The CQ bit was checked by ccameron@chromium.org

[commit-bot: I haz the power, 2017-05-08 07:22:47]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-08 07:55:33]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1494228126690860, "parent_rev":
"ec1e50e27b3c97347a595e5da762115574111dd1", "commit_rev":
"cd8d494cec6d51ecddcb7e3ac09eb8661212e4f5"}

[commit-bot: I haz the power, 2017-05-08 07:55:42]

Description was changed from

==========
mac: Don't set background color from a frame until frame is displayed

The first frame for dark-themed new tab pages still has a background
color of white, even though the frame's content is all black tiles.

Before this patch, we would set the background color to white, and then
later put up the black tiles in front, resulting in a white flash.

This updates all of those parts atomically in the same CATransaction.

BUG=470669
==========

to

==========
mac: Don't set background color from a frame until frame is displayed

The first frame for dark-themed new tab pages still has a background
color of white, even though the frame's content is all black tiles.

Before this patch, we would set the background color to white, and then
later put up the black tiles in front, resulting in a white flash.

This updates all of those parts atomically in the same CATransaction.

BUG=470669

Review-Url: https://codereview.chromium.org/2866983002
Cr-Commit-Position: refs/heads/master@{#469919}
Committed:
https://chromium.googlesource.com/chromium/src/+/cd8d494cec6d51ecddcb7e3ac09e...
==========

[commit-bot: I haz the power, 2017-05-08 07:55:44]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/cd8d494cec6d51ecddcb7e3ac09e...