Add --properties for things like gitHash that describe the current nanobench run.

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
@@ skipping 369 matching lines @@
         'tools.gyp:picture_renderer',
         'tools.gyp:picture_utils',
       ],
     },
     {
       'target_name': 'bench_pictures',
       'type': 'executable',
       'sources': [
         '../bench/BenchLogger.cpp',
         '../bench/BenchLogger.h',
-        '../bench/ResultsWriter.cpp',
         '../tools/PictureBenchmark.cpp',
         '../tools/PictureResultsWriter.h',
         '../tools/bench_pictures_main.cpp',
       ],
       'include_dirs': [
         '../src/core/',
         '../bench',
         '../src/lazy/',
       ],
       'dependencies': [
@@ skipping 342 matching lines @@
               'flags.gyp:flags',
               'skia_lib.gyp:skia_lib',
               'resources',
             ],
           },
         ],
       },
     ],
   ],
 }