Make a layer for popup MessageView

Make a layer for popup MessageView

Previously all MessageView had an own layer. And now, by http://crrev.com/2849523005, only non-popup MessageView, which is in the message center, has a layer.

But it causes a regression (http://crbug.com/722647) so this CL reverts that part.

This CL breaks swiping on popup but it'll be fixed soon by http://crrev.com/2873553002.

BUG=722647
TEST=manual (issue doesn't happen)

Review-Url: https://codereview.chromium.org/2880243003
Cr-Commit-Position: refs/heads/master@{#473838}
(cherry picked from commit f98677dc227b94e8101184484eb0c8959218a508)

Review-Url: https://codereview.chromium.org/2903213002 .
Cr-Commit-Position: refs/branch-heads/3071@{#692}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/9fd4ce201b7b35eb228833bcee64e5a62c48b145

[yoshiki, 2017-05-25 06:54:45]

Description was changed from

==========
Make a layer for popup MessageView

Previously all MessageView had an own layer. And now, by
http://crrev.com/2849523005, only non-popup MessageView, which is in the message
center, has a layer.

But it causes a regression (http://crbug.com/722647) so this CL reverts that
part.

This CL breaks swiping on popup but it'll be fixed soon by
http://crrev.com/2873553002.

BUG=722647
TEST=manual (issue doesn't happen)

Review-Url: https://codereview.chromium.org/2880243003
Cr-Commit-Position: refs/heads/master@{#473838}
(cherry picked from commit f98677dc227b94e8101184484eb0c8959218a508)
==========

to

==========
Make a layer for popup MessageView

Previously all MessageView had an own layer. And now, by
http://crrev.com/2849523005, only non-popup MessageView, which is in the message
center, has a layer.

But it causes a regression (http://crbug.com/722647) so this CL reverts that
part.

This CL breaks swiping on popup but it'll be fixed soon by
http://crrev.com/2873553002.

BUG=722647
TEST=manual (issue doesn't happen)

Review-Url: https://codereview.chromium.org/2880243003
Cr-Commit-Position: refs/heads/master@{#473838}
(cherry picked from commit f98677dc227b94e8101184484eb0c8959218a508)

Review-Url: https://codereview.chromium.org/2903213002 .
Cr-Commit-Position: refs/branch-heads/3071@{#692}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/9fd4ce201b7b35eb228833bcee64...
==========

[yoshiki, 2017-05-25 06:54:48]

Committed patchset #1 (id:1) manually as
9fd4ce201b7b35eb228833bcee64e5a62c48b145.