[Win] Make drawAttention on shaped windows only flash taskbar icon.

[Win] Make drawAttention on shaped windows only flash taskbar icon.

Flashing the icon and title bar on a shaped window causes the window to
flicker (see bug). Shaped windows have no title bar anyway, so just
flash the taskbar icon.

BUG=426283
Committed: https://crrev.com/b9924f89fade35d7900ca7cb99b5b3617f058af7
Cr-Commit-Position: refs/heads/master@{#301787}

[jackhou1, 2014-10-29 03:18:30]

jackhou@chromium.org changed reviewers:
+ sky@chromium.org

[jackhou1, 2014-10-29 03:18:30]

sky, could you take look?

[sky, 2014-10-29 03:42:23]

LGTM

[jackhou1, 2014-10-29 04:08:25]

The CQ bit was checked by jackhou@chromium.org

[commit-bot: I haz the power, 2014-10-29 04:09:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/688473004/1

[commit-bot: I haz the power, 2014-10-29 04:56:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-29 04:56:58]

Patchset 1 (id:??) landed as
https://crrev.com/b9924f89fade35d7900ca7cb99b5b3617f058af7
Cr-Commit-Position: refs/heads/master@{#301787}