[runtime] temporarily transform IsContext check from DHECK to CHECK

[runtime] temporarily transform IsContext check from DCHECK to CHECK

We are enabling this trial on canary to see if we can flush out some missing
context restores.

BUG=

Committed: https://crrev.com/ec94ad400dc257af396efa3b1899bc3168347d82
Cr-Commit-Position: refs/heads/master@{#37875}

[Camillo Bruni, 2016-07-19 15:00:39]

cbruni@chromium.org changed reviewers:
+ jkummerow@chromium.org

[Camillo Bruni, 2016-07-19 15:00:40]

PTAL

[Camillo Bruni, 2016-07-19 15:02:16]

Description was changed from

==========
[runtime] temporarily transform IsContext check from DHECK to CHECK

We are enabling this trial on canary to see if we can flush out some missing
context restores.

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

to

==========
[runtime] temporarily transform IsContext check from DCHECK to CHECK

We are enabling this trial on canary to see if we can flush out some missing
context restores.

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

[Jakob Kummerow, 2016-07-19 15:02:45]

lgtm

[Camillo Bruni, 2016-07-19 15:02:55]

The CQ bit was checked by cbruni@chromium.org

[commit-bot: I haz the power, 2016-07-19 15:03:05]

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, 2016-07-19 15:25:48]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-07-19 15:26:24]

Description was changed from

==========
[runtime] temporarily transform IsContext check from DCHECK to CHECK

We are enabling this trial on canary to see if we can flush out some missing
context restores.

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

to

==========
[runtime] temporarily transform IsContext check from DCHECK to CHECK

We are enabling this trial on canary to see if we can flush out some missing
context restores.

BUG=

Committed: https://crrev.com/ec94ad400dc257af396efa3b1899bc3168347d82
Cr-Commit-Position: refs/heads/master@{#37875}
==========

[commit-bot: I haz the power, 2016-07-19 15:26:25]

Patchset 2 (id:??) landed as
https://crrev.com/ec94ad400dc257af396efa3b1899bc3168347d82
Cr-Commit-Position: refs/heads/master@{#37875}

[Camillo Bruni, 2016-09-01 12:30:36]

A revert of this CL (patchset #2 id:20001) has been created in
https://codereview.chromium.org/2303543003/ by cbruni@chromium.org.

The reason for reverting is: There have been no more occurrences of this on dev
/ beta so we can convert the CHECK back to DCHECK..