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This CL adds a class for extraction of audio and video metadata using ffmpeg.

This is needed to implement the Media Galleries Metadata API for Chrome extensions.

BUG=318450

Review URL: https://codereview.chromium.org/121383002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243470 0039d316-1c4b-4281-b951-d872f2087c98