Oilpan: exempt CSSBasicShapeValue from GC plugin checking.

Oilpan: exempt CSSBasicShapeValue from GC plugin checking.

The GC plugin isn't capable of determining that CSSValue's
traceAfterDispatch() method is safe for subtypes of CSSBasicShapeValue
and throws an error. Until the plugin or the method have been adjusted
into a form that passes the plugin's static checks, exempt the
class from the GC plugin's reach.

R=haraken
BUG=535448
Committed: https://crrev.com/ede2b736857fdb9665a685a690f092477a27b9dd
Cr-Commit-Position: refs/heads/master@{#350508}

[sof, 2015-09-24 07:48:05]

sigbjornf@opera.com changed reviewers:
+ oilpan-reviews@chromium.org

[sof, 2015-09-24 07:48:05]

please take a look.

(It's a new world, looks like the default Cc:s didn't carry over to this CL?)

[haraken, 2015-09-24 07:51:04]

LGTM as a short-term fix.

[sof, 2015-09-24 07:52:56]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-09-24 07:53:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1365003002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1365003002/1

[commit-bot: I haz the power, 2015-09-24 08:47:50]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-24 08:48:34]

Patchset 1 (id:??) landed as
https://crrev.com/ede2b736857fdb9665a685a690f092477a27b9dd
Cr-Commit-Position: refs/heads/master@{#350508}