Fold alpha to the inner savelayer in savelayer-savelayer-restore patterns

src/core/SkRecordPattern.h

Index: src/core/SkRecordPattern.h
diff --git a/src/core/SkRecordPattern.h b/src/core/SkRecordPattern.h
index 68a3aa315e5fba1be6cd7023181b3f98c714f94b..85c38ac5fe6c3666c1bdb124348d579073d2e00a 100644
--- a/src/core/SkRecordPattern.h
+++ b/src/core/SkRecordPattern.h
@@ -132,6 +132,7 @@ public:
     template <typename T> T* first()  { return fHead.get(); }
     template <typename T> T* second() { return fTail.fHead.get(); }
     template <typename T> T* third()  { return fTail.fTail.fHead.get(); }
+    template <typename T> T* fourth()  { return fTail.fTail.fTail.fHead.get(); }
 
 private:
     // If head isn't a Star, try to match at i once.
@@ -182,6 +183,18 @@ struct Pattern2 : Cons<A, Pattern1<B> > {};
 template <typename A, typename B, typename C>
 struct Pattern3 : Cons<A, Pattern2<B, C> > {};
 
+template <typename A, typename B, typename C, typename D>
+struct Pattern4 : Cons<A, Pattern3<B, C, D> > {};
+
+template <typename A, typename B, typename C, typename D, typename E>
+struct Pattern5 : Cons<A, Pattern4<B, C, D, E> > {};
+
+template <typename A, typename B, typename C, typename D, typename E, typename F>
+struct Pattern6 : Cons<A, Pattern5<B, C, D, E, F> > {};
+
+template <typename A, typename B, typename C, typename D, typename E, typename F, typename G>
+struct Pattern7 : Cons<A, Pattern6<B, C, D, E, F, G> > {};
+
 }  // namespace SkRecords
 
 #endif//SkRecordPattern_DEFINED