Start cleaning up 64bit Win warnings

https://codereview.chromium.org/27192003/



git-svn-id: http://skia.googlecode.com/svn/trunk@11764 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrDefaultPathRenderer.cpp b/src/gpu/GrDefaultPathRenderer.cpp
index bd52ce1..85485c8 100644
--- a/src/gpu/GrDefaultPathRenderer.cpp
+++ b/src/gpu/GrDefaultPathRenderer.cpp
@@ -317,8 +317,8 @@
     SkASSERT((vert - base) <= maxPts);
     SkASSERT((idx - idxBase) <= maxIdxs);
 
-    *vertexCnt = vert - base;
-    *indexCnt = idx - idxBase;
+    *vertexCnt = static_cast<int>(vert - base);
+    *indexCnt = static_cast<int>(idx - idxBase);
 
     }
     return true;