Oilpan: Add HeapCollection thread affinity detection traits.
Oilpan: Add HeapCollection thread affinity detection traits.

While investigating Keishi's changelist I noticed that these
were missing. They determine the thread affinity for heap
allocated collections. This is needed in order to get
persistent handles to such collections allocated in the
right thread heap.

R=haraken@chromium.org, vegorov@chromium.org
BUG=

Review URL: https://codereview.chromium.org/149563005

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166723 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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