[ash-md] Properly scales windows with transient parents in overview

[ash-md] Properly scales windows with transient parents in overview

Previously to this CL the code was only considering the focused window
when calculating scale for the overview mode transform. It needs to
consider the bounding rectangle of the whole transient parent's tree.

BUG=632694
Review-Url: https://codereview.chromium.org/2197773002
Cr-Commit-Position: refs/heads/master@{#408763}
(cherry picked from commit 0e4a6217e4694b15ba76a51b406254e9a4f22e1e)

Committed: https://chromium.googlesource.com/chromium/src/+/149ce74ddadbf5cb76ee003d3088f46363bbe014

[varkha, 2016-08-02 19:16:04]

Committed patchset #1 (id:1) manually as
149ce74ddadbf5cb76ee003d3088f46363bbe014.

[varkha, 2016-08-02 19:16:37]

Description was changed from

==========
[ash-md] Properly scales windows with transient parents in overview

Previously to this CL the code was only considering the focused window
when calculating scale for the overview mode transform. It needs to
consider the bounding rectangle of the whole transient parent's tree.

BUG=632694

Review-Url: https://codereview.chromium.org/2197773002
Cr-Commit-Position: refs/heads/master@{#408763}
(cherry picked from commit 0e4a6217e4694b15ba76a51b406254e9a4f22e1e)
==========

to

==========
[ash-md] Properly scales windows with transient parents in overview

Previously to this CL the code was only considering the focused window
when calculating scale for the overview mode transform. It needs to
consider the bounding rectangle of the whole transient parent's tree.

BUG=632694

Review-Url: https://codereview.chromium.org/2197773002
Cr-Commit-Position: refs/heads/master@{#408763}
(cherry picked from commit 0e4a6217e4694b15ba76a51b406254e9a4f22e1e)
==========

[varkha, 2016-08-02 19:16:51]

Committed patchset #1 (id:1) manually as
149ce74ddadbf5cb76ee003d3088f46363bbe014.

[varkha, 2016-08-02 19:19:43]

Description was changed from

==========
[ash-md] Properly scales windows with transient parents in overview

Previously to this CL the code was only considering the focused window
when calculating scale for the overview mode transform. It needs to
consider the bounding rectangle of the whole transient parent's tree.

BUG=632694

Review-Url: https://codereview.chromium.org/2197773002
Cr-Commit-Position: refs/heads/master@{#408763}
(cherry picked from commit 0e4a6217e4694b15ba76a51b406254e9a4f22e1e)
==========

to

==========
[ash-md] Properly scales windows with transient parents in overview

Previously to this CL the code was only considering the focused window
when calculating scale for the overview mode transform. It needs to
consider the bounding rectangle of the whole transient parent's tree.

BUG=632694

Review-Url: https://codereview.chromium.org/2197773002
Cr-Commit-Position: refs/heads/master@{#408763}
(cherry picked from commit 0e4a6217e4694b15ba76a51b406254e9a4f22e1e)

Committed:
https://chromium.googlesource.com/chromium/src/+/149ce74ddadbf5cb76ee003d3088...
==========