Recognize GC_PLUGIN_IGNORE() on 'operator new' declarations.

Recognize GC_PLUGIN_IGNORE() on 'operator new' declarations.

For the select few times an overriding "operator new" is needed for a
GC class, provide the GC_PLUGIN_IGNORE() escape hatch for these. The
responsibility that the "new"'s allocation will be on the Oilpan heap,
rests with the implementor of the class.

R=haraken
BUG=443854
Committed: https://crrev.com/3077ee89020f929c9c9a4eda8154a028523e6274
Cr-Commit-Position: refs/heads/master@{#319141}

[sof, 2015-03-04 14:31:52]

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

[sof, 2015-03-04 14:31:53]

Please take a look.

This is also needed for crbug.com/456823

[haraken, 2015-03-04 14:46:15]

LGTM

[sof, 2015-03-04 21:58:50]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-03-04 22:01:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/975393002/1

[commit-bot: I haz the power, 2015-03-04 22:26:24]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-04 22:27:21]

Patchset 1 (id:??) landed as
https://crrev.com/3077ee89020f929c9c9a4eda8154a028523e6274
Cr-Commit-Position: refs/heads/master@{#319141}