peephole optimize save/restore brackets that contain no draw calls.
Review URL: https://codereview.appspot.com/6443149

git-svn-id: http://skia.googlecode.com/svn/trunk@5347 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/core/SkPictureRecord.h b/src/core/SkPictureRecord.h
index 7c388a0..e4420f3 100644
--- a/src/core/SkPictureRecord.h
+++ b/src/core/SkPictureRecord.h
@@ -89,7 +89,7 @@
     void fillRestoreOffsetPlaceholdersForCurrentStackLevel(
         uint32_t restoreOffset);
 
-    SkTDArray<uint32_t> fRestoreOffsetStack;
+    SkTDArray<int32_t> fRestoreOffsetStack;
     int fFirstSavedLayerIndex;
     enum {
         kNoSavedLayerIndex = -1