Linux Aura: Fix overlay shadows on notifications

Linux Aura: Fix overlay shadows on notifications

>Linux Aura got support for translucent windows in CL:
>https://chromium.googlesource.com/chromium/src.git/+/62ba78ffcdf525eb9ed640724e640fcf22fbbf87
>
>Some Chrome widgets used a TRANSLUCENT_WINDOW opacity for widgets that
>fade in or out, but that don't actually have an alpha mask.  This was
>to support a limitation on MS Windows where windows must be
>translucent to fade.
>
>However, most Linux window managers only draw shadows on opaque
>windows: that is, windows that do not have an alpha channel.  Windows
>that fade in or out may still have shadows since opacity is set as a
>property of the toplevel window.
>
>Therefore, the solution is to use INFER_OPACITY for fading widgets so
>it will work across platforms.  TRANSLUCENT_WINDOW should only be used
>on widgets that have alpha masks.
>
>BUG=640170
>
>R=sky@chromium.org
>
>patch from issue 2398203002 at patchset 40001
>(http://crrev.com/2398203002#ps40001)
>

NOTRY=true
NOPRESUBMIT=true
BUG=640170
TBR=sky@chromium.org

[Tom Anderson, 2016-11-28 21:26:58]

The CQ bit was checked by thomasanderson@chromium.org

[commit-bot: I haz the power, 2016-11-28 21:28:26]

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, 2016-11-28 21:40:03]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1480368418449500, "parent_rev":
"7f8427b888cdb77386178f07e50e51d15cce34f3", "commit_rev":
"29149fe2349efd048eab7eccd79362758741d0bc"}

[commit-bot: I haz the power, 2016-11-28 21:40:32]

Committed patchset #1 (id:1)