Support nested calc()

Support nested calc()

This patch adds support for nested calc(). This just means that where we
allow a left parenthesis we also allow using calc(. Nested calc() can be
useful when using variables as it allows variables to be used inside
calc() expressions more freely.

FF added support for nested calc() a couple of weeks ago. While we
support -webkit-calc(), we don't add nesting support for it.

BUG=600113
https://drafts.csswg.org/css-values/#calc-syntax
https://bugzilla.mozilla.org/show_bug.cgi?id=968761

Committed: https://crrev.com/08d6e889c5efdf7d93e0badcd1cd5dcb8e79574c
Cr-Commit-Position: refs/heads/master@{#385076}

[Timothy Loh, 2016-04-04 02:09:38]

timloh@chromium.org changed reviewers:
+ alancutter@chromium.org, nainar@chromium.org

[nainar, 2016-04-04 04:24:56]

lgtm

[Timothy Loh, 2016-04-05 01:27:50]

The CQ bit was checked by timloh@chromium.org

[commit-bot: I haz the power, 2016-04-05 01:28:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1856633002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1856633002/1

[commit-bot: I haz the power, 2016-04-05 01:35:04]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-05 01:36:53]

Description was changed from

==========
Support nested calc()

This patch adds support for nested calc(). This just means that where we
allow a left parenthesis we also allow using calc(. Nested calc() can be
useful when using variables as it allows variables to be used inside
calc() expressions more freely.

FF added support for nested calc() a couple of weeks ago. While we
support -webkit-calc(), we don't add nesting support for it.

BUG=600113

https://drafts.csswg.org/css-values/#calc-syntax
https://bugzilla.mozilla.org/show_bug.cgi?id=968761
==========

to

==========
Support nested calc()

This patch adds support for nested calc(). This just means that where we
allow a left parenthesis we also allow using calc(. Nested calc() can be
useful when using variables as it allows variables to be used inside
calc() expressions more freely.

FF added support for nested calc() a couple of weeks ago. While we
support -webkit-calc(), we don't add nesting support for it.

BUG=600113

https://drafts.csswg.org/css-values/#calc-syntax
https://bugzilla.mozilla.org/show_bug.cgi?id=968761

Committed: https://crrev.com/08d6e889c5efdf7d93e0badcd1cd5dcb8e79574c
Cr-Commit-Position: refs/heads/master@{#385076}
==========

[commit-bot: I haz the power, 2016-04-05 01:36:54]

Patchset 1 (id:??) landed as
https://crrev.com/08d6e889c5efdf7d93e0badcd1cd5dcb8e79574c
Cr-Commit-Position: refs/heads/master@{#385076}