Unwrap GrRedBlackTree unit test and use REPORTER_ASSERT().

gyp/tests.gyp

 # GYP file to build unit tests.
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
     {
       'target_name': 'tests',
       'type': 'executable',
       'include_dirs' : [
@@ skipping 57 matching lines @@
         '../tests/FillPathTest.cpp',
         '../tests/FitsInTest.cpp',
         '../tests/FlatDataTest.cpp',
         '../tests/FlateTest.cpp',
         '../tests/FontHostStreamTest.cpp',
         '../tests/FontHostTest.cpp',
         '../tests/FontMgrTest.cpp',
         '../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',
         '../tests/ImageFilterTest.cpp',
         '../tests/InfRectTest.cpp',
         '../tests/JpegTest.cpp',
         '../tests/LListTest.cpp',
         '../tests/LayerDrawLooperTest.cpp',
         '../tests/MD5Test.cpp',
         '../tests/MallocPixelRefTest.cpp',
@@ skipping 77 matching lines @@
       'conditions': [
         [ 'skia_gpu == 1', {
           'include_dirs': [
             '../src/gpu',
           ],
         }],
       ],
     },
   ],
 }