Add benchmarks for 3 and 4 colors (most common)

bench/HardStopGradientBench.cpp

Index: bench/HardStopGradientBench.cpp
diff --git a/bench/HardStopGradientBench.cpp b/bench/HardStopGradientBench.cpp
index 7ebc51c9ed28cafb8a903c067e1ba8bdb353cc82..3a323fec6fade66f9ea8428158cea8b068f5ad6d 100644
--- a/bench/HardStopGradientBench.cpp
+++ b/bench/HardStopGradientBench.cpp
@@ -97,6 +97,8 @@ private:
 };
 
 // Clamp
+DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode,   3);)
+DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode,   4);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode,   5);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode,  10);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode,  25);)
@@ -104,6 +106,8 @@ DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode,  50);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kClamp_TileMode, 100);)
 
 // Repeat
+DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode,   3);)
+DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode,   4);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode,   5);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode,  10);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode,  25);)
@@ -111,6 +115,8 @@ DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode,  50);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kRepeat_TileMode, 100);)
 
 // Mirror
+DEF_BENCH(return new HardStopGradientBench(SkShader::kMirror_TileMode,   3);)
+DEF_BENCH(return new HardStopGradientBench(SkShader::kMirror_TileMode,   4);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kMirror_TileMode,   5);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kMirror_TileMode,  10);)
 DEF_BENCH(return new HardStopGradientBench(SkShader::kMirror_TileMode,  25);)