simplify path validate

Reduce path validation interfaces,
deferring the harder work of rewriting
the callers until later.

R=reed@google.com,enne@chromium.org

Change-Id: Iea56f1cd1be93bb1d96b50836a9bd3cd4872ad23
Reviewed-on: https://skia-review.googlesource.com/37541
Commit-Queue: Cary Clark <caryclark@google.com>
Reviewed-by: Adrienne Walker <enne@chromium.org>
diff --git a/src/core/SkPath.cpp b/src/core/SkPath.cpp
index 32ec2c5..5dcca6f 100644
--- a/src/core/SkPath.cpp
+++ b/src/core/SkPath.cpp
@@ -2220,7 +2220,7 @@
 }
 
 
-bool SkPath::isValid() const {
+bool SkPath::isValidImpl() const {
     if ((fFillType & ~3) != 0) {
         return false;
     }