Add Media.AudioRendererEvents histogram to measure how often OnRenderError() is called.

BUG=234708

Review URL: https://codereview.chromium.org/14054019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@196442 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed