Likely contains a security fix for CVE-2012-5127, see bug 442096.
I'll have to verify that 0.2.1 contains the fix. Release notes do mention _some_ security fixes. Not sure why upstream is not more precise.
0.2.1 in Portage
Integer overflow in Google Chrome before 23.0.1271.64 allows remote
attackers to cause a denial of service (out-of-bounds read) or possibly have
unspecified other impact via a crafted WebP image.
Arch teams, please test and mark stable:
Stable KEYWORDS : alpha amd64 arm hppa ia64 ppc ppc64 x86
Stable for HPPA.
stable arm ppc ppc64
New GLSA request filed.
This issue was resolved and addressed in
GLSA 201312-08 at http://security.gentoo.org/glsa/glsa-201312-08.xml
by GLSA coordinator Sergey Popov (pinkbyte).