Re-add PassRefPtr constructors erroneously removed in r154312
Re-add PassRefPtr constructors erroneously removed in r154312

Raw pointers passed to WebGLGetInfo are coerced to bools instead of PassRefPtrs,
thus the need to explicitly construct PassRefPtrs.

TBR=esprehn

Review URL: https://codereview.chromium.org/19371003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@154315 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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