Initial implementation of a SkColorSpace_A2B xform

src/core/SkRasterPipeline.h

Index: src/core/SkRasterPipeline.h
diff --git a/src/core/SkRasterPipeline.h b/src/core/SkRasterPipeline.h
index 9193de520232ca4ac04a3b3b1f854563184e21cc..015dd0ad2bfb9b581e309cb8dc7b732d75c87274 100644
--- a/src/core/SkRasterPipeline.h
+++ b/src/core/SkRasterPipeline.h
@@ -54,12 +54,16 @@
 // TODO: There may be a better place to stuff tail, e.g. in the bottom alignment bits of
 // the Stage*.  This mostly matters on 64-bit Windows where every register is precious.
 
+#define DECLARE_GAMMA(M, name) M(name##_r) M(name##_g) M(name##_b) M(name##_a)
+
 #define SK_RASTER_PIPELINE_STAGES(M)                             \
     M(move_src_dst) M(clamp_0) M(clamp_a) M(unpremul) M(premul)  \
     M(constant_color) M(store_f32)                               \
     M(load_s_565)  M(load_d_565)  M(store_565)                   \
     M(load_s_srgb) M(load_d_srgb) M(store_srgb)                  \
     M(load_s_f16)  M(load_d_f16)  M(store_f16)                   \
+    M(load_s_linear_rgba) M(load_s_linear_bgra)                  \
+    M(store_linear_rgba) M(store_linear_bgra)                    \
     M(scale_u8) M(scale_constant_float)                          \
     M(lerp_u8) M(lerp_565) M(lerp_constant_float)                \
     M(dst)                                                       \
@@ -68,7 +72,9 @@
     M(clear) M(modulate) M(multiply) M(plus_) M(screen) M(xor_)  \
     M(colorburn) M(colordodge) M(darken) M(difference)           \
     M(exclusion) M(hardlight) M(lighten) M(overlay) M(softlight) \
-    M(luminance_to_alpha) M(matrix_4x5)
+    M(luminance_to_alpha) M(matrix_4x4) M(matrix_4x5)            \
+    DECLARE_GAMMA(M, param_gamma) DECLARE_GAMMA(M, table_gamma)  \
+    M(clut) M(labtoxyz)
 
 class SkRasterPipeline {
 public: