Add testing for Rectanizer-derived classes

gyp/tests.gypi

 # Common gypi for unit tests.
 {
   'include_dirs': [
     '../src/core',
     '../src/effects',
     '../src/image',
     '../src/lazy',
     '../src/images',
     '../src/pathops',
     '../src/pdf',
@@ skipping 69 matching lines @@
     '../tests/FontHostTest.cpp',
     '../tests/FontMgrTest.cpp',
     '../tests/FontNamesTest.cpp',
     '../tests/FrontBufferedStreamTest.cpp',
     '../tests/GLInterfaceValidationTest.cpp',
     '../tests/GLProgramsTest.cpp',
     '../tests/GeometryTest.cpp',
     '../tests/GifTest.cpp',
     '../tests/GpuColorFilterTest.cpp',
     '../tests/GpuDrawPathTest.cpp',
+    '../tests/GpuRectanizerTest.cpp',
     '../tests/GrBinHashKeyTest.cpp',
     '../tests/GrContextFactoryTest.cpp',
     '../tests/GrDrawTargetTest.cpp',
     '../tests/GrMemoryPoolTest.cpp',
     '../tests/GrRedBlackTreeTest.cpp',
     '../tests/GrOrderedSetTest.cpp',
     '../tests/GrSurfaceTest.cpp',
     '../tests/GrTBSearchTest.cpp',
     '../tests/GradientTest.cpp',
     '../tests/HashCacheTest.cpp',
@@ skipping 92 matching lines @@
 
     '../tests/PipeTest.cpp',
     '../src/pipe/utils/SamplePipeControllers.cpp',
 
     '../tests/TDStackNesterTest.cpp',
     '../experimental/PdfViewer/src/SkTDStackNester.h',
 
     '../tools/sk_tool_utils.cpp',
   ],
 }