Cache dst LUTs in SkColorSpaceXform

bench/ColorCodecBench.cpp

Index: bench/ColorCodecBench.cpp
diff --git a/bench/ColorCodecBench.cpp b/bench/ColorCodecBench.cpp
index 9ae5601d49ef512d8792ce1b25819e0505156c2b..6aa46d609f5877bb5e624ff66c4b45bf395a26c3 100644
--- a/bench/ColorCodecBench.cpp
+++ b/bench/ColorCodecBench.cpp
@@ -18,6 +18,7 @@ DEFINE_bool(qcms,       false, "Bench qcms color conversion");
 #endif
 DEFINE_bool(xform_only, false, "Only time the color xform, do not include the decode time");
 DEFINE_bool(srgb,       false, "Convert to srgb dst space");
+DEFINE_bool(nonstd,     false, "Convert to non-standard dst space");
 DEFINE_bool(half,       false, "Convert to half floats");
 
 ColorCodecBench::ColorCodecBench(const char* name, sk_sp<SkData> encoded)
@@ -172,6 +173,13 @@ void ColorCodecBench::onDelayedSetup() {
         fDstSpace = as_CSB(fDstSpace)->makeLinearGamma();
     }
 
+    if (FLAGS_nonstd) {
+        float gammas[3] = { 1.8f, 2.0f, 2.5f, };
+        SkMatrix44 matrix = SkMatrix44(SkMatrix44::kUninitialized_Constructor);
+        matrix.set3x3(0.30f, 0.31f, 0.28f, 0.32f, 0.33f, 0.29f, 0.27f, 0.30f, 0.30f);
+        fDstSpace = SkColorSpace::NewRGB(gammas, matrix);
+    }
+
     fDstInfo = fDstInfo.makeColorSpace(fDstSpace);
 
     fDst.reset(fDstInfo.getSafeSize(fDstInfo.minRowBytes()));