Set analytic AA as default.

src/core/SkPath.cpp

Index: src/core/SkPath.cpp
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index c1b63271938849b284daf766df9fde2be196e41f..626c8f5405d5f496d069cccc271777e79c5aedc6 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -1742,6 +1742,8 @@ void SkPath::transform(const SkMatrix& matrix, SkPath* dst) const {
             dst->fIsVolatile = fIsVolatile;
         }
 
+        dst->fConvexity = SkPath::kUnknown_Convexity;

[reed1, 2016/11/07 15:31:42]

If we're going to leave this in for real, please add a comment and a bug as to
why. This has performance implications so we shouldn't leave this here
unnecessarily.

[liyuqian, 2016/11/07 16:08:00]

Done.

+
         if (SkPathPriv::kUnknown_FirstDirection == fFirstDirection) {
             dst->fFirstDirection = SkPathPriv::kUnknown_FirstDirection;
         } else {