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for this CL, also keep the old dev interface
around temporarily, to avoid tree breakage.
Add sample_rate to RecommendSampleFrameCount() to the
non-dev audio interface. Currently ignored, but useful
information to use when we need to refine RecommendSampleFrameCount()

Review URL: http://codereview.chromium.org/6279003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71527 0039d316-1c4b-4281-b951-d872f2087c98