Add a bench to measure SkPictureRecorder constant overhead.

gyp/bench.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_dirs': [
     '../src/core',
     '../src/effects',
     '../src/gpu',
     '../src/utils',
@@ skipping 68 matching lines @@
     '../bench/MorphologyBench.cpp',
     '../bench/MutexBench.cpp',
     '../bench/PMFloatBench.cpp',
     '../bench/PatchBench.cpp',
     '../bench/PatchGridBench.cpp',
     '../bench/PathBench.cpp',
     '../bench/PathIterBench.cpp',
     '../bench/PathUtilsBench.cpp',
     '../bench/PerlinNoiseBench.cpp',
     '../bench/PictureNestingBench.cpp',
+    '../bench/PictureOverheadBench.cpp',
     '../bench/PicturePlaybackBench.cpp',
     '../bench/PremulAndUnpremulAlphaOpsBench.cpp',
     '../bench/RTreeBench.cpp',
     '../bench/ReadPixBench.cpp',
     '../bench/RectBench.cpp',
     '../bench/RectanizerBench.cpp',
     '../bench/RectoriBench.cpp',
     '../bench/RefCntBench.cpp',
     '../bench/RegionBench.cpp',
     '../bench/RegionContainBench.cpp',
     '../bench/RepeatTileBench.cpp',
     '../bench/RotatedRectBench.cpp',
     '../bench/ScalarBench.cpp',
     '../bench/ShaderMaskBench.cpp',
     '../bench/SkipZeroesBench.cpp',
     '../bench/SortBench.cpp',
     '../bench/StrokeBench.cpp',
     '../bench/TableBench.cpp',
     '../bench/TextBench.cpp',
     '../bench/TextBlobBench.cpp',
     '../bench/TileBench.cpp',
     '../bench/VertBench.cpp',
     '../bench/WritePixelsBench.cpp',
     '../bench/WriterBench.cpp',
     '../bench/XfermodeBench.cpp',
   ],
 }