Added CompoundBuffer that will be used to store data in the encoding/decoding
pipeline.

BUG=None
TEST=Unittests

Review URL: http://codereview.chromium.org/4779001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@66209 0039d316-1c4b-4281-b951-d872f2087c98
21 files changed