Improves output audio on most Android devices.

This CL modifies the existing buffer settings on the render side for WebRTC clients on Android. We need it because the output audio QoS is very bad today on common devices like Samsung Galaxy S3. There is still room for improvements for low-latency devices (e.g. Nexus 7) but I will deal with that in later CLs. The goal of this CL is to make a patch which improves audio on as many devices as possible in one stroke.

BUG=256851,288692
TEST=apprtc in loopback on Android devices like HTC One and Samsung Galaxy S4.
R=tommi@chromium.org, wjia@chromium.org

Review URL: https://codereview.chromium.org/23583051

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224952 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224952