Add the bench_pictures makefile.
Add the bench_pictures makefile.

When https://codereview.chromium.org/391423002/ lands, we will be
generating the makefile for bench_pictures. Add it to the master-skia
branch.

BUG=skia:2744
R=borenet@google.com, djsollen@google.com

Author: scroggo@google.com

Review URL: https://codereview.chromium.org/397133002

Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot,google/skia-buildbot,google/skia-buildbot,Tiger66639/skia-buildbot