Add support for Mac NPAPI drawing model negotiation, along with a stub of Quickdraw model support (work in progress--QD plugins no longer crash, but they don't draw correctly either).
Add support for Mac NPAPI drawing model negotiation, along with a stub
of Quickdraw model support (work in progress--QD plugins no longer
crash, but they don't draw correctly either).

Superseded by http://codereview.chromium.org/211031

Stuart: review
John: FYI

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/173532

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@32097 0039d316-1c4b-4281-b951-d872f2087c98

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