aw: Ensure WebView stays alive until functor detach

aw: Ensure WebView stays alive until functor detach

Android will not guarantee that the WebView is not garbage colllected
before functor detached is called. So we need to add a gc root while the
functor detached callback is pending.

BUG=597167
Committed: https://crrev.com/8e2e091e5c565b90e76ceb85dd4c848013c5cf94
Cr-Commit-Position: refs/heads/master@{#387071}

[boliu, 2016-04-13 18:44:33]

boliu@chromium.org changed reviewers:
+ tobiasjs@chromium.org

[boliu, 2016-04-13 18:44:34]

ptal

[boliu, 2016-04-13 18:44:39]

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

[commit-bot: I haz the power, 2016-04-13 18:44:55]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1880243004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1880243004/1

[Tobias Sargeant, 2016-04-13 19:10:41]

lgtm

[commit-bot: I haz the power, 2016-04-13 19:36:01]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-13 19:36:03]

Dry run: This issue passed the CQ dry run.

[boliu, 2016-04-13 19:44:30]

The CQ bit was checked by boliu@chromium.org

[commit-bot: I haz the power, 2016-04-13 19:44:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1880243004/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1880243004/1

[commit-bot: I haz the power, 2016-04-13 19:51:05]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-13 19:52:28]

Description was changed from

==========
aw: Ensure WebView stays alive until functor detach

Android will not guarantee that the WebView is not garbage colllected
before functor detached is called. So we need to add a gc root while the
functor detached callback is pending.

BUG=597167
==========

to

==========
aw: Ensure WebView stays alive until functor detach

Android will not guarantee that the WebView is not garbage colllected
before functor detached is called. So we need to add a gc root while the
functor detached callback is pending.

BUG=597167

Committed: https://crrev.com/8e2e091e5c565b90e76ceb85dd4c848013c5cf94
Cr-Commit-Position: refs/heads/master@{#387071}
==========

[commit-bot: I haz the power, 2016-04-13 19:52:29]

Patchset 1 (id:??) landed as
https://crrev.com/8e2e091e5c565b90e76ceb85dd4c848013c5cf94
Cr-Commit-Position: refs/heads/master@{#387071}

[boliu, 2016-04-15 23:56:05]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1897583002/ by boliu@chromium.org.

The reason for reverting is: API changed.