Add helper for creating leaf FPs inside GrFP::TestCreate functions

gyp/gpu.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 # Include this gypi to include all 'gpu' files
 # The parent gyp/gypi file must define
 #       'skia_src_path'     e.g. skia/trunk/src
 #       'skia_include_path' e.g. skia/trunk/include
 #
 # The skia build defines these in common_variables.gypi
@@ skipping 118 matching lines @@
       '<(skia_src_path)/gpu/GrPendingProgramElement.h',
       '<(skia_src_path)/gpu/GrPipeline.cpp',
       '<(skia_src_path)/gpu/GrPipeline.h',
       '<(skia_src_path)/gpu/GrPipelineBuilder.cpp',
       '<(skia_src_path)/gpu/GrPipelineBuilder.h',
       '<(skia_src_path)/gpu/GrPrimitiveProcessor.cpp',
       '<(skia_src_path)/gpu/GrPrimitiveProcessor.h',
       '<(skia_src_path)/gpu/GrProgramDesc.h',
       '<(skia_src_path)/gpu/GrProgramElement.cpp',
       '<(skia_src_path)/gpu/GrProcessor.cpp',
+      '<(skia_src_path)/gpu/GrProcessorUnitTest.cpp',
       '<(skia_src_path)/gpu/GrProcessorDataManager.cpp',
       '<(skia_src_path)/gpu/GrProcOptInfo.cpp',
       '<(skia_src_path)/gpu/GrProcOptInfo.h',
       '<(skia_src_path)/gpu/GrGpuResourceRef.cpp',
       '<(skia_src_path)/gpu/GrQuad.h',
       '<(skia_src_path)/gpu/GrRecordReplaceDraw.cpp',
       '<(skia_src_path)/gpu/GrRecordReplaceDraw.h',
       '<(skia_src_path)/gpu/GrRectanizer.h',
       '<(skia_src_path)/gpu/GrRectanizer_pow2.cpp',
       '<(skia_src_path)/gpu/GrRectanizer_pow2.h',
@@ skipping 298 matching lines @@
       '<(skia_src_path)/gpu/gl/debug/SkDebugGLContext.cpp',
       '<(skia_src_path)/gpu/gl/debug/SkDebugGLContext.h',
     ],
     'skgpu_null_gl_sources': [
       '<(skia_src_path)/gpu/gl/GrGLCreateNullInterface.cpp',
       '<(skia_src_path)/gpu/gl/SkNullGLContext.cpp',
       '<(skia_include_path)/gpu/gl/SkNullGLContext.h',
     ],
   },
 }