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In order to let RenderPass control allocation of DrawQuads, public DQ
constructors, and make all use of DQ::Create function to make_scoped_ptr
of public constructors.

Similar to 271683004, and follow 380893004.

BUG=344962

Review URL: https://codereview.chromium.org/398533002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@283389 0039d316-1c4b-4281-b951-d872f2087c98