add support for capped hairlines

src/core/SkPathRef.cpp

Index: src/core/SkPathRef.cpp
diff --git a/src/core/SkPathRef.cpp b/src/core/SkPathRef.cpp
index 12429aecfcc889b3244ab03c40dbfea423464780..acf72d98589dab3a42ee2b753281d5bebe1892a5 100644
--- a/src/core/SkPathRef.cpp
+++ b/src/core/SkPathRef.cpp
@@ -573,6 +573,11 @@ uint8_t SkPathRef::Iter::next(SkPoint pts[4]) {
     return (uint8_t) verb;
 }
 
+uint8_t SkPathRef::Iter::peek() const {
+    const uint8_t* next = fVerbs - 1;
+    return next <= fVerbStop ? (uint8_t) SkPath::kDone_Verb : *next;
+}
+
 #ifdef SK_DEBUG
 void SkPathRef::validate() const {
     this->INHERITED::validate();