use a black brush instead of a null brush for window background

use a black brush instead of a null brush for window background

Yet another attempt at fixing black flash and window garbage on resize in Win8. I don't have any good reason why this should make any difference, but http://msdn.microsoft.com/en-us/library/windows/desktop/bb688195(v=vs.85).aspx#extending specifically mentions using GetStockObject(BLACK_BRUSH) so perhaps this triggers some magic behavior.

R=sky@chromium.org
BUG=290481
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=223645

[sky, 2013-09-16 20:55:13]

LGTM

[commit-bot: I haz the power, 2013-09-16 23:04:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/scottmg@chromium.org/23437036/1

[commit-bot: I haz the power, 2013-09-17 01:38:26]

Retried try job too often on win_rel for step(s) content_unittests, unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-09-17 02:24:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/scottmg@chromium.org/23437036/1

[commit-bot: I haz the power, 2013-09-17 07:55:38]

Retried try job too often on win_rel for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-09-17 16:38:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/scottmg@chromium.org/23437036/1

[commit-bot: I haz the power, 2013-09-17 18:39:48]

Change committed as 223645