[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/2657453003 .
Cr-Commit-Position: refs/branch-heads/2987@{#47}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/e86ab7d65162a39b16e19710445f09e357c27a1e

[varkha, 2017-01-23 23:53:03]

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/2657453003 .
Cr-Commit-Position: refs/branch-heads/2987@{#47}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/e86ab7d65162a39b16e19710445f...
==========

[varkha, 2017-01-23 23:53:05]

Committed patchset #1 (id:1) manually as
e86ab7d65162a39b16e19710445f09e357c27a1e.