Add nanobench, a fresh look at our microbenchmark harness.

gyp/bench.gypi

 {
   'include_dirs': [
     '../src/core',
     '../src/effects',
+    '../src/gpu',
     '../src/utils',
     '../tools',
   ],
   'dependencies': [
+    'etc1.gyp:libetc1',
     'skia_lib.gyp:skia_lib',
+    'tools.gyp:resources',
+    'tools.gyp:sk_tool_utils',
+  ],
+  'conditions': [
+    ['skia_gpu == 1', {
+      'include_dirs': [ '../src/gpu' ],
+      'dependencies': [ 'gputest.gyp:skgputest' ],
+    }],
   ],
   'sources': [
     '../bench/Benchmark.cpp',
     '../bench/Benchmark.h',
 
     '../bench/AAClipBench.cpp',
     '../bench/BicubicBench.cpp',
     '../bench/BitmapBench.cpp',
     '../bench/BitmapRectBench.cpp',
     '../bench/BitmapScaleBench.cpp',
@@ skipping 65 matching lines @@
     '../bench/StrokeBench.cpp',
     '../bench/TableBench.cpp',
     '../bench/TextBench.cpp',
     '../bench/TileBench.cpp',
     '../bench/VertBench.cpp',
     '../bench/WritePixelsBench.cpp',
     '../bench/WriterBench.cpp',
     '../bench/XfermodeBench.cpp',
   ],
 }