add new blit2 methods in support of antialiased hairlines guard flag SK_SUPPORT_LEGACY_BLITANTIH2V2

src/core/SkCoreBlitters.h

Index: src/core/SkCoreBlitters.h
diff --git a/src/core/SkCoreBlitters.h b/src/core/SkCoreBlitters.h
index f4a5d6f4dbbfab199600411adeb5faa977aec22a..acc18febede6e44ac3cbd6c0ab2ff592b370ccd4 100644
--- a/src/core/SkCoreBlitters.h
+++ b/src/core/SkCoreBlitters.h
@@ -120,6 +120,10 @@ public:
     virtual void blitRect(int x, int y, int width, int height);
     virtual void blitMask(const SkMask&, const SkIRect&);
     virtual const SkBitmap* justAnOpaqueColor(uint32_t*);
+#ifndef SK_SUPPORT_LEGACY_BLITANTIH2V2
+    void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override;
+    void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override;
+#endif
 
 protected:
     SkColor                fColor;
@@ -140,6 +144,10 @@ public:
     SkARGB32_Opaque_Blitter(const SkBitmap& device, const SkPaint& paint)
         : INHERITED(device, paint) { SkASSERT(paint.getAlpha() == 0xFF); }
     virtual void blitMask(const SkMask&, const SkIRect&);
+#ifndef SK_SUPPORT_LEGACY_BLITANTIH2V2
+    void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override;
+    void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override;
+#endif
 
 private:
     typedef SkARGB32_Blitter INHERITED;
@@ -150,6 +158,10 @@ public:
     SkARGB32_Black_Blitter(const SkBitmap& device, const SkPaint& paint)
         : INHERITED(device, paint) {}
     virtual void blitAntiH(int x, int y, const SkAlpha antialias[], const int16_t runs[]);
+#ifndef SK_SUPPORT_LEGACY_BLITANTIH2V2
+    void blitAntiH2(int x, int y, U8CPU a0, U8CPU a1) override;
+    void blitAntiV2(int x, int y, U8CPU a0, U8CPU a1) override;
+#endif
 
 private:
     typedef SkARGB32_Opaque_Blitter INHERITED;