Return early from VisualViewport::initializeScrollbars if not attached yet.

Return early from VisualViewport::initializeScrollbars if not attached yet.

During navigation with DevTools emulation enabled, we end up calling
initializeScrollbars too early. Just ignore it.

BUG=584614
Committed: https://crrev.com/73b58476391aec96038fc6716c5cd06280ea409c
Cr-Commit-Position: refs/heads/master@{#374299}

[dgozman, 2016-02-08 22:19:51]

dgozman@chromium.org changed reviewers:
+ bokan@chromium.org, pfeldman@chromium.org

[dgozman, 2016-02-08 22:19:52]

David, could you please take a look?

+Pavel for owners.

[bokan, 2016-02-08 22:36:17]

lgtm

[pfeldman, 2016-02-09 00:50:48]

lgtm

[dgozman, 2016-02-09 01:12:58]

The CQ bit was checked by dgozman@chromium.org

[commit-bot: I haz the power, 2016-02-09 01:16:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1673393002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1673393002/1

[commit-bot: I haz the power, 2016-02-09 04:27:33]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-02-09 04:29:47]

Description was changed from

==========
Return early from VisualViewport::initializeScrollbars if not attached yet.

During navigation with DevTools emulation enabled, we end up calling
initializeScrollbars too early. Just ignore it.

BUG=584614
==========

to

==========
Return early from VisualViewport::initializeScrollbars if not attached yet.

During navigation with DevTools emulation enabled, we end up calling
initializeScrollbars too early. Just ignore it.

BUG=584614

Committed: https://crrev.com/73b58476391aec96038fc6716c5cd06280ea409c
Cr-Commit-Position: refs/heads/master@{#374299}
==========

[commit-bot: I haz the power, 2016-02-09 04:29:48]

Patchset 1 (id:??) landed as
https://crrev.com/73b58476391aec96038fc6716c5cd06280ea409c
Cr-Commit-Position: refs/heads/master@{#374299}