use int instead of size_t to match skia convention

include/core/SkPicture.h

Index: include/core/SkPicture.h
diff --git a/include/core/SkPicture.h b/include/core/SkPicture.h
index 4db64bf93d80ff594effa0a0a156300a6bebf108..dedda3e31ddf0e081083d49ad8f771dc6c1bc011 100644
--- a/include/core/SkPicture.h
+++ b/include/core/SkPicture.h
@@ -202,14 +202,14 @@ public:
     // An array of refcounted const SkPicture pointers.
     class SnapshotArray : ::SkNoncopyable {
     public:
-        SnapshotArray(const SkPicture* pics[], size_t count) : fPics(pics), fCount(count) {}
-        ~SnapshotArray() { for (size_t i = 0; i < fCount; i++) { fPics[i]->unref(); } }
+        SnapshotArray(const SkPicture* pics[], int count) : fPics(pics), fCount(count) {}
+        ~SnapshotArray() { for (int i = 0; i < fCount; i++) { fPics[i]->unref(); } }
 
         const SkPicture* const* begin() const { return fPics; }
-        size_t count() const { return fCount; }
+        int count() const { return fCount; }
     private:
         SkAutoTMalloc<const SkPicture*> fPics;
-        size_t fCount;
+        int fCount;
     };
 
 private: