Fixes disappearing text in Find in page toolbar in slide over.

Fixes disappearing text in Find in page toolbar in slide over.

Find in page text is persisted through UIPasteboard that is always
returning nil when the application is running in background. Because of
this, when the application with Find in page is backgrounded and tries
to back up and recreate text, it sometimes removes all traces of the
find in page query by restoring it from pasteboard in background.
This behavior is new to iOS 9 and undocumented, although well known.

BUG=532912
TEST=Navigate to any page and find something in page. Backgroudn the app
and open it as slideover over any other app (Calendar). Check that the
search query is persisted through this operation.

Committed: https://crrev.com/ccca3cf7c1801a86a3f762c83fb6907204026691
Cr-Commit-Position: refs/heads/master@{#370684}

[stkhapugin, 2016-01-21 13:04:03]

stkhapugin@chromium.org changed reviewers:
+ droger@chromium.org

[stkhapugin, 2016-01-21 13:04:03]

PTAL

[droger, 2016-01-21 13:20:22]

lgtm

[stkhapugin, 2016-01-21 13:23:35]

The CQ bit was checked by stkhapugin@chromium.org

[commit-bot: I haz the power, 2016-01-21 13:24:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1614913002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1614913002/1

[commit-bot: I haz the power, 2016-01-21 13:42:16]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-01-21 13:44:22]

Description was changed from

==========
Fixes disappearing text in Find in page toolbar in slide over.

Find in page text is persisted through UIPasteboard that is always
returning nil when the application is running in background. Because of
this, when the application with Find in page is backgrounded and tries
to back up and recreate text, it sometimes removes all traces of the
find in page query by restoring it from pasteboard in background.
This behavior is new to iOS 9 and undocumented, although well known.

BUG=532912
TEST=Navigate to any page and find something in page. Backgroudn the app
and open it as slideover over any other app (Calendar). Check that the
search query is persisted through this operation.
==========

to

==========
Fixes disappearing text in Find in page toolbar in slide over.

Find in page text is persisted through UIPasteboard that is always
returning nil when the application is running in background. Because of
this, when the application with Find in page is backgrounded and tries
to back up and recreate text, it sometimes removes all traces of the
find in page query by restoring it from pasteboard in background.
This behavior is new to iOS 9 and undocumented, although well known.

BUG=532912
TEST=Navigate to any page and find something in page. Backgroudn the app
and open it as slideover over any other app (Calendar). Check that the
search query is persisted through this operation.

Committed: https://crrev.com/ccca3cf7c1801a86a3f762c83fb6907204026691
Cr-Commit-Position: refs/heads/master@{#370684}
==========

[commit-bot: I haz the power, 2016-01-21 13:44:22]

Patchset 1 (id:??) landed as
https://crrev.com/ccca3cf7c1801a86a3f762c83fb6907204026691
Cr-Commit-Position: refs/heads/master@{#370684}