Unwrap GrRedBlackTree unit test and use REPORTER_ASSERT().

gyp/tests.gyp

Index: gyp/tests.gyp
diff --git a/gyp/tests.gyp b/gyp/tests.gyp
index bbd605ea583ab7689fb0b0ed48c36ca3512639bd..2edb03f522dc5277e62e45cb33ba839bcd2bd31c 100644
--- a/gyp/tests.gyp
+++ b/gyp/tests.gyp
@@ -75,18 +75,19 @@
         '../tests/FontNamesTest.cpp',
         '../tests/FrontBufferedStreamTest.cpp',
         '../tests/GeometryTest.cpp',
-        '../tests/GifTest.cpp',
         '../tests/GLInterfaceValidation.cpp',
         '../tests/GLProgramsTest.cpp',
+        '../tests/GifTest.cpp',
         '../tests/GpuBitmapCopyTest.cpp',
         '../tests/GpuColorFilterTest.cpp',
         '../tests/GpuDrawPathTest.cpp',
         '../tests/GrContextFactoryTest.cpp',
         '../tests/GrDrawTargetTest.cpp',
-        '../tests/GradientTest.cpp',
         '../tests/GrMemoryPoolTest.cpp',
+        '../tests/GrRedBlackTreeTest.cpp',
         '../tests/GrSurfaceTest.cpp',
         '../tests/GrUnitTests.cpp',
+        '../tests/GradientTest.cpp',
         '../tests/HashCacheTest.cpp',
         '../tests/ImageCacheTest.cpp',
         '../tests/ImageDecodingTest.cpp',