Implement a benchmark for GrResourceCache

gyp/bench.gypi

 # sources and conditions used in skia's bench.gyp and chromium's skia.gyp
 #
 {
   'sources': [
     '../bench/benchmain.cpp',
     '../bench/SkBenchmark.h',
     '../bench/SkBenchmark.cpp',
     '../bench/AAClipBench.cpp',
     '../bench/BicubicBench.cpp',
     '../bench/BitmapBench.cpp',
@@ skipping 13 matching lines @@
     '../bench/DecodeBench.cpp',
     '../bench/DeferredCanvasBench.cpp',
     '../bench/DeferredSurfaceCopyBench.cpp',
     '../bench/DisplacementBench.cpp',
     '../bench/FontCacheBench.cpp',
     '../bench/FontScalerBench.cpp',
     '../bench/FSRectBench.cpp',
     '../bench/GameBench.cpp',
     '../bench/GradientBench.cpp',
     '../bench/GrMemoryPoolBench.cpp',
+    '../bench/GrResourceCacheBench.cpp',
     '../bench/ImageCacheBench.cpp',
     '../bench/ImageDecodeBench.cpp',
     '../bench/InterpBench.cpp',
     '../bench/HairlinePathBench.cpp',
     '../bench/LineBench.cpp',
     '../bench/LightingBench.cpp',
     '../bench/MagnifierBench.cpp',
     '../bench/MathBench.cpp',
     '../bench/Matrix44Bench.cpp',
     '../bench/MatrixBench.cpp',
@@ skipping 34 matching lines @@
     '../bench/SkBenchLogger.h',
     '../bench/SkBenchLogger.cpp',
   ],
 }
 
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