Add check for trivial string equality

Add check for trivial string equality

BUG=

Committed: https://pdfium.googlesource.com/pdfium/+/3d704888eb6f5c72edd3abe6e5e48a62ef218975

[Tom Sepez, 2016-09-13 23:38:15]

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

[commit-bot: I haz the power, 2016-09-13 23:38:25]

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

[Tom Sepez, 2016-09-13 23:39:25]

tsepez@chromium.org changed reviewers:
+ dsinclair@chromium.org

[Tom Sepez, 2016-09-13 23:39:26]

Its likely that two strings may be sharing the same underlying buffer, in which
case we know they are 
equal without any string ops.

[Tom Sepez, 2016-09-13 23:39:43]

Description was changed from

==========
Add check for trivial string equality

BUG=
==========

to

==========
Add check for trivial string equality

BUG=
==========

[commit-bot: I haz the power, 2016-09-13 23:51:55]

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

[commit-bot: I haz the power, 2016-09-13 23:51:55]

Dry run: This issue passed the CQ dry run.

[dsinclair, 2016-09-14 01:08:42]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2016-09-14 01:08:43]

lgtm

[commit-bot: I haz the power, 2016-09-14 01:08:50]

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, 2016-09-14 01:10:25]

Description was changed from

==========
Add check for trivial string equality

BUG=
==========

to

==========
Add check for trivial string equality

BUG=

Committed:
https://pdfium.googlesource.com/pdfium/+/3d704888eb6f5c72edd3abe6e5e48a62ef21...
==========

[commit-bot: I haz the power, 2016-09-14 01:10:26]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/3d704888eb6f5c72edd3abe6e5e48a62ef21...