Fixes Android framework build.
When building for the Android framework, we depend on SkUserConfig.h
to define things like SK_SUPPORT_GPU. So we cannot have the first
include inside a guard requring SK_SUPPORT_GPU to be defined. Include
SkTypes first, which will pull in SkUserConfig, define the flag, and
allow us to include GrContextFactory.h.
R=reed@google.com, djsollen@google.com
Author: scroggo@google.com
Review URL: https://codereview.chromium.org/394533003
