Avoid warnings on GCC 4.8.4

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2183243002

[mtklein adds...]
TBR=reed@google.com
No public API changes.

Review-Url: https://codereview.chromium.org/2183243002
diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index 4d99fdd..d1af4f3 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -183,7 +183,7 @@
      */
     bool isOval(SkRect* rect, Direction* dir = nullptr,
                 unsigned* start = nullptr) const {
-        bool isCCW;
+        bool isCCW = false;
         bool result = fPathRef->isOval(rect, &isCCW, start);
         if (dir && result) {
             *dir = isCCW ? kCCW_Direction : kCW_Direction;
@@ -205,7 +205,7 @@
      */
     bool isRRect(SkRRect* rrect, Direction* dir = nullptr,
                  unsigned* start = nullptr) const {
-        bool isCCW;
+        bool isCCW = false;
         bool result = fPathRef->isRRect(rrect, &isCCW, start);
         if (dir && result) {
             *dir = isCCW ? kCCW_Direction : kCW_Direction;