[ash-md] Makes sure that minimized windows can be activated in overview

[ash-md] Makes sure that minimized windows can be activated in overview

When windows are minimized before entering overview mode, they are
replaced with a widget that has mirrored layers. Opacity of the original
window needs to be then set to 1 in order to make it visible
(in WindowMirrorView::InitLayerOwner()).
Upon exiting overview the original window's opacity is restored.
This logic breaks if a window is selected - the opacity need not be
restored (to zero).
Make it so that the opacity is set to 1 upon exit if a window is
selected.

BUG=677177
Review-Url: https://codereview.chromium.org/2637403013
Cr-Commit-Position: refs/heads/master@{#445524}
(cherry picked from commit 8f64e9220762c7c7d5237cb4b4222898c5b0f4dc)

Review-Url: https://codereview.chromium.org/2654153002 .
Cr-Commit-Position: refs/branch-heads/2924@{#866}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}
Committed: https://chromium.googlesource.com/chromium/src/+/ba1d61d4f88c04b5440233dbf7966eaffb159413

[varkha, 2017-01-25 20:40:42]

Description was changed from

==========
[ash-md] Makes sure that minimized windows can be activated in overview

When windows are minimized before entering overview mode, they are
replaced with a widget that has mirrored layers. Opacity of the original
window needs to be then set to 1 in order to make it visible
(in WindowMirrorView::InitLayerOwner()).
Upon exiting overview the original window's opacity is restored.
This logic breaks if a window is selected - the opacity need not be
restored (to zero).
Make it so that the opacity is set to 1 upon exit if a window is
selected.

BUG=677177

Review-Url: https://codereview.chromium.org/2637403013
Cr-Commit-Position: refs/heads/master@{#445524}
(cherry picked from commit 8f64e9220762c7c7d5237cb4b4222898c5b0f4dc)
==========

to

==========
[ash-md] Makes sure that minimized windows can be activated in overview

When windows are minimized before entering overview mode, they are
replaced with a widget that has mirrored layers. Opacity of the original
window needs to be then set to 1 in order to make it visible
(in WindowMirrorView::InitLayerOwner()).
Upon exiting overview the original window's opacity is restored.
This logic breaks if a window is selected - the opacity need not be
restored (to zero).
Make it so that the opacity is set to 1 upon exit if a window is
selected.

BUG=677177

Review-Url: https://codereview.chromium.org/2637403013
Cr-Commit-Position: refs/heads/master@{#445524}
(cherry picked from commit 8f64e9220762c7c7d5237cb4b4222898c5b0f4dc)

Review-Url: https://codereview.chromium.org/2654153002 .
Cr-Commit-Position: refs/branch-heads/2924@{#866}
Cr-Branched-From:
3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}
Committed:
https://chromium.googlesource.com/chromium/src/+/ba1d61d4f88c04b5440233dbf796...
==========

[varkha, 2017-01-25 20:40:43]

Committed patchset #1 (id:1) manually as
ba1d61d4f88c04b5440233dbf7966eaffb159413 (tree was closed).