Reland of [ash-md] Fades overview header in and out

Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and animates its bounds and opacity such that it appears to take over the real header. Only once the "fake" header is opaque a mask or alpha shape is applied to the window to hide its original header after which the "fake" header becomes translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is restored for the overview mode from the minimized state and is thus animated from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076, 645708
TEST=Most changes are only really visible under a great slow-down but watching closely the files app header transform into overview mode should be much less abrupt.

Committed: https://crrev.com/ebc9b9dfb7982cf069897b750a76231ab5bb2e31
Cr-Commit-Position: refs/heads/master@{#418017}

[varkha, 2016-09-12 16:46:53]

The CQ bit was checked by varkha@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-09-12 16:47:11]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[varkha, 2016-09-12 16:49:41]

Description was changed from

==========
Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and
animates its bounds and opacity such that it appears to take over the real
header. Only once the "fake" header is opaque a mask or alpha shape is applied
to the window to hide its original header after which the "fake" header becomes
translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is
restored for the overview mode from the minimized state and is thus animated
from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076
TEST=Most changes are only really visible under a great slow-down but watching
closely the files app header transform into overview mode should be much less
abrupt.
==========

to

==========
Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and
animates its bounds and opacity such that it appears to take over the real
header. Only once the "fake" header is opaque a mask or alpha shape is applied
to the window to hide its original header after which the "fake" header becomes
translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is
restored for the overview mode from the minimized state and is thus animated
from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076, 645708
TEST=Most changes are only really visible under a great slow-down but watching
closely the files app header transform into overview mode should be much less
abrupt.
==========

[varkha, 2016-09-12 17:00:50]

varkha@chromium.org changed reviewers:
+ bruthig@chromium.org, sky@chromium.org

[varkha, 2016-09-12 17:00:50]

sky@, bruthig@, Please take a look - trying to re-land after it failed in tests
where the animations are run and completed synchronously so the sequence is
different.
Thanks!

[bruthig, 2016-09-12 17:43:06]

lgtm

[sky, 2016-09-12 18:11:59]

LGTM

[varkha, 2016-09-12 18:58:11]

The CQ bit was checked by varkha@chromium.org

[commit-bot: I haz the power, 2016-09-12 18:58:54]

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, 2016-09-12 20:07:50]

Description was changed from

==========
Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and
animates its bounds and opacity such that it appears to take over the real
header. Only once the "fake" header is opaque a mask or alpha shape is applied
to the window to hide its original header after which the "fake" header becomes
translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is
restored for the overview mode from the minimized state and is thus animated
from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076, 645708
TEST=Most changes are only really visible under a great slow-down but watching
closely the files app header transform into overview mode should be much less
abrupt.
==========

to

==========
Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and
animates its bounds and opacity such that it appears to take over the real
header. Only once the "fake" header is opaque a mask or alpha shape is applied
to the window to hide its original header after which the "fake" header becomes
translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is
restored for the overview mode from the minimized state and is thus animated
from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076, 645708
TEST=Most changes are only really visible under a great slow-down but watching
closely the files app header transform into overview mode should be much less
abrupt.
==========

[commit-bot: I haz the power, 2016-09-12 20:07:51]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-09-12 20:10:11]

Description was changed from

==========
Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and
animates its bounds and opacity such that it appears to take over the real
header. Only once the "fake" header is opaque a mask or alpha shape is applied
to the window to hide its original header after which the "fake" header becomes
translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is
restored for the overview mode from the minimized state and is thus animated
from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076, 645708
TEST=Most changes are only really visible under a great slow-down but watching
closely the files app header transform into overview mode should be much less
abrupt.
==========

to

==========
Reland of [ash-md] Fades overview header in and out

This change installs an additional header on top of the real window's header and
animates its bounds and opacity such that it appears to take over the real
header. Only once the "fake" header is opaque a mask or alpha shape is applied
to the window to hide its original header after which the "fake" header becomes
translucent to conform to MD overview mode spec.

This creates a visually smoother transition into overview mode than before.

Special care is taken to animate the "fake" header in case when the window is
restored for the overview mode from the minimized state and is thus animated
from the shelf item.

---

This relands https://codereview.chromium.org/2239233002/ and
reverts commit 758e34e4a30be65c2cedf5fb2a893fa3a87596f0.

Corrects lifetime manipulation of the child views after their
ownership it taken over by a CleanupAnimationObserver.

BUG=624608, 645076, 645708
TEST=Most changes are only really visible under a great slow-down but watching
closely the files app header transform into overview mode should be much less
abrupt.

Committed: https://crrev.com/ebc9b9dfb7982cf069897b750a76231ab5bb2e31
Cr-Commit-Position: refs/heads/master@{#418017}
==========

[commit-bot: I haz the power, 2016-09-12 20:10:13]

Patchset 2 (id:??) landed as
https://crrev.com/ebc9b9dfb7982cf069897b750a76231ab5bb2e31
Cr-Commit-Position: refs/heads/master@{#418017}