ash: Do not allow minimizing windows in login screen.

ash: Do not allow minimizing windows in login screen.

Minimizing windows (e.g. network proxy window) in a login screen do not make much sense.
And it causes unpredictable behaviour. So do not allow minimizing windows in login screen.

BUG=167386
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=180900

[sadrul, 2013-02-06 00:14:22]

Hi! Does this look like a reasonable approach for fixing this? I can add tests
if the approach looks OK.

[sky, 2013-02-06 00:38:42]

https://codereview.chromium.org/12220026/diff/6001/ash/wm/window_util.cc
File ash/wm/window_util.cc (right):

https://codereview.chromium.org/12220026/diff/6001/ash/wm/window_util.cc#newc...
ash/wm/window_util.cc:73: internal::RootWindowController::ForActiveRootWindow();
Shouldn't this lookup the RWC based on |window|?

[sadrul, 2013-02-06 00:57:39]

https://codereview.chromium.org/12220026/diff/6001/ash/wm/window_util.cc
File ash/wm/window_util.cc (right):

https://codereview.chromium.org/12220026/diff/6001/ash/wm/window_util.cc#newc...
ash/wm/window_util.cc:73: internal::RootWindowController::ForActiveRootWindow();
On 2013/02/06 00:38:42, sky wrote:
> Shouldn't this lookup the RWC based on |window|?

Indeed it should. I shied away from using it since it took a non-const window.
But looks like it can take a const window just as easily. So I have changed
RootWindowController::ForWindow to take a non-const aura::Window, and made
necessary const-changes elsewhere, and used ForWindow here. Thanks!

[sky, 2013-02-06 01:06:31]

LGTM