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This CL adds support for experimental exclusive-mode streaming to WASAPIAudioOutputStream. Enabling the flag "enable-exclusive-mode" will ensure that output audio streaming on Windows runs in exclusive mode (if the user has allowed it).

Initial tests shows that we can reach latencies of about 3.33ms for 48kHz. As a comparison, for shared-mode, the total latency is ~35ms (even if the time between each OnMoreData() callback is ~10ms).

BUG=133483
TEST=media_unittests --enable-exclusive-audio --gtest_filter=WinAudioOutputTest*

Review URL: https://chromiumcodereview.appspot.com/10575017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148731 0039d316-1c4b-4281-b951-d872f2087c98