Revert of Remove WINDOW_TYPE_V1_PANEL AppWindow type

Revert of Remove WINDOW_TYPE_V1_PANEL AppWindow type (patchset #2 id:20001 of https://codereview.chromium.org/2886293002/ )

Reason for revert:
Breaks compile on ChromiumOS x86-generic due to unused-but-set variable saw_focus_key

Original issue's description:
> Remove WINDOW_TYPE_V1_PANEL AppWindow type
> 
> Changes:
> Currently, panel window is only used as Chrome OS's audio player, which is WINDOW_TYPE_PANEL. WINDOW_TYPE_V1_PANEL is not a AppWindow type in use any more. Remove it in code base.
> 
> BUG=691099
> TEST=covered by tests
> 
> Review-Url: https://codereview.chromium.org/2886293002
> Cr-Commit-Position: refs/heads/master@{#472661}
> Committed: https://chromium.googlesource.com/chromium/src/+/0775f98187d5d895b15b46212f55d30956aa946e

TBR=benwells@chromium.org,oshima@chromium.org,warx@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=691099
Review-Url: https://codereview.chromium.org/2891043002
Cr-Commit-Position: refs/heads/master@{#472740}
Committed: https://chromium.googlesource.com/chromium/src/+/3cb8f0afe629acb8806b0d20ec00d539f7114406

[Marc Treib, 2017-05-18 08:27:20]

The CQ bit was checked by treib@chromium.org

[Marc Treib, 2017-05-18 08:27:21]

Created Revert of Remove WINDOW_TYPE_V1_PANEL AppWindow type

[commit-bot: I haz the power, 2017-05-18 08:27:44]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-05-18 08:28:12]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1495096040497440, "parent_rev":
"ad3ffab411cc396ffb20c1d35dcff6de038f14b4", "commit_rev":
"3cb8f0afe629acb8806b0d20ec00d539f7114406"}

[commit-bot: I haz the power, 2017-05-18 08:28:31]

Description was changed from

==========
Revert of Remove WINDOW_TYPE_V1_PANEL AppWindow type (patchset #2 id:20001 of
https://codereview.chromium.org/2886293002/ )

Reason for revert:
Breaks compile on ChromiumOS x86-generic due to unused-but-set variable
saw_focus_key

Original issue's description:
> Remove WINDOW_TYPE_V1_PANEL AppWindow type
> 
> Changes:
> Currently, panel window is only used as Chrome OS's audio player, which is
WINDOW_TYPE_PANEL. WINDOW_TYPE_V1_PANEL is not a AppWindow type in use any more.
Remove it in code base.
> 
> BUG=691099
> TEST=covered by tests
> 
> Review-Url: https://codereview.chromium.org/2886293002
> Cr-Commit-Position: refs/heads/master@{#472661}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0775f98187d5d895b15b46212f55...

TBR=benwells@chromium.org,oshima@chromium.org,warx@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=691099
==========

to

==========
Revert of Remove WINDOW_TYPE_V1_PANEL AppWindow type (patchset #2 id:20001 of
https://codereview.chromium.org/2886293002/ )

Reason for revert:
Breaks compile on ChromiumOS x86-generic due to unused-but-set variable
saw_focus_key

Original issue's description:
> Remove WINDOW_TYPE_V1_PANEL AppWindow type
> 
> Changes:
> Currently, panel window is only used as Chrome OS's audio player, which is
WINDOW_TYPE_PANEL. WINDOW_TYPE_V1_PANEL is not a AppWindow type in use any more.
Remove it in code base.
> 
> BUG=691099
> TEST=covered by tests
> 
> Review-Url: https://codereview.chromium.org/2886293002
> Cr-Commit-Position: refs/heads/master@{#472661}
> Committed:
https://chromium.googlesource.com/chromium/src/+/0775f98187d5d895b15b46212f55...

TBR=benwells@chromium.org,oshima@chromium.org,warx@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=691099

Review-Url: https://codereview.chromium.org/2891043002
Cr-Commit-Position: refs/heads/master@{#472740}
Committed:
https://chromium.googlesource.com/chromium/src/+/3cb8f0afe629acb8806b0d20ec00...
==========

[commit-bot: I haz the power, 2017-05-18 08:28:33]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/3cb8f0afe629acb8806b0d20ec00...