Add blink_gc_plugin variable to enable the clang plugin for checking GC consistency.
Add blink_gc_plugin variable to enable the clang plugin for checking GC consistency.

R=abarth@chromium.org, ager@chromium.org
BUG=

Review URL: https://codereview.chromium.org/133473002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@166005 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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