[Merge to M57] ChromeOS MD: Fix cannot drag tab onto immersive fullscreen window

[Merge to M57] ChromeOS MD: Fix cannot drag tab onto immersive fullscreen window

changes:
This CL is a follow-up fix for https://codereview.chromium.org/2326703002/ MD change.
The new MD design completely hides tabstrip without light bar anymore. In this case, we could consider tabstrip as visible.

TBR=sky@chromium.org, tdanderson@chromium.org, yiyix@chromium.org
BUG=676698
TEST=emulator test saw bug fixed.

Review-Url: https://codereview.chromium.org/2640433004
Cr-Commit-Position: refs/heads/master@{#447658}
(cherry picked from commit a4cc8622a6cca4971414a46acf812c7ea4e410eb)

Review-Url: https://codereview.chromium.org/2668413004 .
Cr-Commit-Position: refs/branch-heads/2987@{#263}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/b6aaac605eaec9919ecdd8d55bdb5236d546a7d6

[Qiang(Joe) Xu, 2017-02-02 04:05:18]

Description was changed from

==========
[Merge to M57] ChromeOS MD: Fix cannot drag tab onto immersive fullscreen window

changes:
This CL is a follow-up fix for https://codereview.chromium.org/2326703002/ MD
change.
The new MD design completely hides tabstrip without light bar anymore. In this
case, we could consider tabstrip as visible.

TBR=sky@chromium.org, tdanderson@chromium.org, yiyix@chromium.org
BUG=676698
TEST=emulator test saw bug fixed.

Review-Url: https://codereview.chromium.org/2640433004
Cr-Commit-Position: refs/heads/master@{#447658}
(cherry picked from commit a4cc8622a6cca4971414a46acf812c7ea4e410eb)
==========

to

==========
[Merge to M57] ChromeOS MD: Fix cannot drag tab onto immersive fullscreen window

changes:
This CL is a follow-up fix for https://codereview.chromium.org/2326703002/ MD
change.
The new MD design completely hides tabstrip without light bar anymore. In this
case, we could consider tabstrip as visible.

TBR=sky@chromium.org, tdanderson@chromium.org, yiyix@chromium.org
BUG=676698
TEST=emulator test saw bug fixed.

Review-Url: https://codereview.chromium.org/2640433004
Cr-Commit-Position: refs/heads/master@{#447658}
(cherry picked from commit a4cc8622a6cca4971414a46acf812c7ea4e410eb)

Review-Url: https://codereview.chromium.org/2668413004 .
Cr-Commit-Position: refs/branch-heads/2987@{#263}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/b6aaac605eaec9919ecdd8d55bdb...
==========

[Qiang(Joe) Xu, 2017-02-02 04:05:19]

Committed patchset #1 (id:1) manually as
b6aaac605eaec9919ecdd8d55bdb5236d546a7d6 (presubmit successful).