Update googletest/googlemock to db9b85e2. Also update all callsites to use INSTANTIATE_TEST_SUITE_P instead of INSTANTIATE_TEST_CASE_P which has been deprecated. Also some minor clang-format changes. Change-Id: If9d0a77931536ac0765d8435068d00e4471f59d0
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.