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For unittest that only testing functionatility of Append DrawQuads and
SharedQuadState, only creates RenderPass for it.

This CL is first part of clean up QuadSink. Next step would be to use
test occlusion tracker for MockQuadSink.

BUG=
TEST=cc_unittests

Review URL: https://codereview.chromium.org/288273003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@271011 0039d316-1c4b-4281-b951-d872f2087c98