Perlin noise adjustments

1 ) Added GPU simplex noise as a comparison to GPU Perlin noise. It can be enabled simply by using a #define (SK_USE_SIMPLEX_NOISE)
2 ) Enabled GPU Perlin noise tests
3 ) Added a small benchmark for noise
4 ) Disabled GPU Perlin noise on Android based on benchmarks

Review URL: https://codereview.chromium.org/14087002

git-svn-id: http://skia.googlecode.com/svn/trunk@8719 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/bench.gypi b/gyp/bench.gypi
index 614f147..74964c3 100644
--- a/gyp/bench.gypi
+++ b/gyp/bench.gypi
@@ -33,6 +33,7 @@
     '../bench/MutexBench.cpp',
     '../bench/PathBench.cpp',
     '../bench/PathIterBench.cpp',
+    '../bench/PerlinNoiseBench.cpp',
     '../bench/PicturePlaybackBench.cpp',
     '../bench/PictureRecordBench.cpp',
     '../bench/ReadPixBench.cpp',