
Added shared page visibility code

R=nathanl,fredz,radokirov,acleung,mesch,rsturgell
DELTA=160  (155 added, 0 deleted, 5 changed)


Revision created by MOE tool push_codebase.
MOE_MIGRATION=4667


git-svn-id: 818616af560c21f974e3119d89e3310384da871a@1946 b0f006be-c8cd-11de-a2e8-8d36a3108c74

knutwalker/google-closure-compiler,knutwalker/google-closure-compiler