Reland "Unwrap GrRedBlackTree unit test and use REPORTER_ASSERT()."

BUG=None
TEST=tests
R=robertphillips@google.com

Review URL: https://codereview.chromium.org/137423009

git-svn-id: http://skia.googlecode.com/svn/trunk@13233 2bbb7eff-a529-9590-31e7-b0007b416f81
4 files changed