GitLab

This adds ability to serialize cc::Picture to base64 string
and to initialize the picture back from that serialization.

Review URL: https://chromiumcodereview.appspot.com/13884018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195361 0039d316-1c4b-4281-b951-d872f2087c98