YUV and color xforms

src/core/SkColorSpaceXform.h

Index: src/core/SkColorSpaceXform.h
diff --git a/src/core/SkColorSpaceXform.h b/src/core/SkColorSpaceXform.h
index c80cd15dcae4f24e335a4e4d1e44f831cdb00a2e..001d71b454f0c549c2669498f8c3db1d7c9bd677 100644
--- a/src/core/SkColorSpaceXform.h
+++ b/src/core/SkColorSpaceXform.h
@@ -41,6 +41,8 @@ public:
     virtual void apply(void* dst, const uint32_t* src, int len, SkColorType dstColorType,
                        SkAlphaType dstAlphaType) const = 0;
 
+    virtual void applyYUV(void* dst, const uint8_t* y, const uint8_t* u, const uint8_t* v, int width) const = 0;
+
     virtual ~SkColorSpaceXform() {}
 };
 
@@ -69,6 +71,8 @@ public:
     void apply(void* dst, const uint32_t* src, int len, SkColorType dstColorType,
                SkAlphaType dstAlphaType) const override;
 
+    void applyYUV(void* dst, const uint8_t* y, const uint8_t* u, const uint8_t* v, int width) const override;
+
     static constexpr int      kDstGammaTableSize = 1024;
 
 private: