shape ops work in progress

git-svn-id: http://skia.googlecode.com/svn/trunk@4119 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/experimental/Intersection/EdgeWalker.cpp b/experimental/Intersection/EdgeWalker.cpp
index 8baf727..e74689f 100644
--- a/experimental/Intersection/EdgeWalker.cpp
+++ b/experimental/Intersection/EdgeWalker.cpp
@@ -2292,7 +2292,7 @@
     ActiveEdge* activePtr, * nextPtr = edgeList[0];
     size_t index;
     bool foundCoincident = false;
-    int firstIndex = 0;
+    size_t firstIndex = 0;
     for (index = 1; index < edgeCount; ++index) {
         activePtr = nextPtr;
         nextPtr = edgeList[index];