Mac: Fix incorrect tab dragging window drawing.

Mac: Fix incorrect tab dragging window drawing.

Tab dragging window doesn't draw correctly after https://crrev.com/900613003/
because BackgroundGradientView no longer calls cr_recursivelySetNeedsDisplay.

Fixed by making TabView and BookmarkButton redraw itself when moved to another
window.

BUG=453996
Committed: https://crrev.com/70a38fbe28f6d9f038e7e81f40617d9bb5aaa1dc
Cr-Commit-Position: refs/heads/master@{#316131}

[Andre, 2015-02-12 22:42:39]

andresantoso@chromium.org changed reviewers:
+ rsesek@chromium.org

[Andre, 2015-02-12 22:42:40]

Robert, PTAL.

[Robert Sesek, 2015-02-12 23:37:45]

lgtm

[Andre, 2015-02-13 00:54:47]

New patchsets have been uploaded after l-g-t-m from rsesek@chromium.org

[Andre, 2015-02-13 00:55:06]

Patchset #2 (id:20001) has been deleted

[Andre, 2015-02-13 01:54:51]

The CQ bit was checked by andresantoso@chromium.org

[commit-bot: I haz the power, 2015-02-13 01:56:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/925583004/1

[commit-bot: I haz the power, 2015-02-13 02:18:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-13 02:18:41]

Patchset 1 (id:??) landed as
https://crrev.com/70a38fbe28f6d9f038e7e81f40617d9bb5aaa1dc
Cr-Commit-Position: refs/heads/master@{#316131}