Split GrUnitTests.cpp into two separate unit tests.

GrUnitTests is too generic. Instead we split this file between the two
APIs being tested there, GrTBSearch and GrBinHashKey.

BUG=None
TEST=tests -m GrTBSearchTest && tests -m GrBinHashKeyTest
R=brian@thesalomons.net, robertphillips@google.com

Review URL: https://codereview.chromium.org/150943002

git-svn-id: http://skia.googlecode.com/svn/trunk@13273 2bbb7eff-a529-9590-31e7-b0007b416f81
5 files changed