Add assert that only one of initial or inherit applyValueCSSPropertyVariable()

Add assert that only one of initial or inherit is true in applyValueCSSPropertyVariable()

This assert was removed in https://codereview.chromium.org/2630683002.
This patch adds it back as it's still worthwhile.

BUG=671904
Review-Url: https://codereview.chromium.org/2632123004
Cr-Commit-Position: refs/heads/master@{#444002}
Committed: https://chromium.googlesource.com/chromium/src/+/00cd466db74e724f2dda6fe6f9d583a0b964bbc5

[alancutter (OOO until 2018), 2017-01-17 06:42:53]

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

[alancutter (OOO until 2018), 2017-01-17 06:43:28]

Description was changed from

==========
Add assert that only one of initial or inherit applyValueCSSPropertyVariable()

This assert was removed in https://codereview.chromium.org/2630683002.
This patch adds it back as it's still worthwhile.

BUG=671904
==========

to

==========
Add assert that only one of initial or inherit is true in
applyValueCSSPropertyVariable()

This assert was removed in https://codereview.chromium.org/2630683002.
This patch adds it back as it's still worthwhile.

BUG=671904
==========

[Timothy Loh, 2017-01-17 06:43:59]

On 2017/01/17 06:42:53, alancutter wrote:

lgtm

[alancutter (OOO until 2018), 2017-01-17 06:46:19]

The CQ bit was checked by alancutter@chromium.org

[commit-bot: I haz the power, 2017-01-17 06:46:37]

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, 2017-01-17 08:08:13]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484635579579520, "parent_rev":
"956c03968aee8c6d45c52a1d237f857fe4e133a3", "commit_rev":
"00cd466db74e724f2dda6fe6f9d583a0b964bbc5"}

[commit-bot: I haz the power, 2017-01-17 08:08:38]

Description was changed from

==========
Add assert that only one of initial or inherit is true in
applyValueCSSPropertyVariable()

This assert was removed in https://codereview.chromium.org/2630683002.
This patch adds it back as it's still worthwhile.

BUG=671904
==========

to

==========
Add assert that only one of initial or inherit is true in
applyValueCSSPropertyVariable()

This assert was removed in https://codereview.chromium.org/2630683002.
This patch adds it back as it's still worthwhile.

BUG=671904

Review-Url: https://codereview.chromium.org/2632123004
Cr-Commit-Position: refs/heads/master@{#444002}
Committed:
https://chromium.googlesource.com/chromium/src/+/00cd466db74e724f2dda6fe6f9d5...
==========

[commit-bot: I haz the power, 2017-01-17 08:08:39]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/00cd466db74e724f2dda6fe6f9d5...