25679 Roll libpng to afda123a503bdc41df13f86316cf5f83bc204761 (cla: yes)

25682 Roll Skia from e05860862631 to d0ef90769b47 (2 revisions) (cla: yes, waiting for tree to go green)

25683 Migrate third_party/expat dependency to googlecode (cla: yes)

25684 Roll Skia from d0ef90769b47 to 04c82165b1c7 (3 revisions) (cla: yes, waiting for tree to go green)

25685 Roll Skia from 04c82165b1c7 to 5ba330cd1324 (1 revision) (cla: yes, waiting for tree to go green)