Fixing SkPicture command pattern optimizations to make them work correctly with bounding box hierar…

src/core/SkRTree.cpp

Index: src/core/SkRTree.cpp
===================================================================
--- src/core/SkRTree.cpp	(revision 8135)
+++ src/core/SkRTree.cpp	(working copy)
@@ -434,6 +434,14 @@
     }
 }
 
+void SkRTree::rewindInserts() {
+    SkASSERT(this->isEmpty()); // Currently only supports deferred inserts
+    while (!fDeferredInserts.isEmpty() &&
+           fClient->shouldRewind(fDeferredInserts.top().fChild.data)) {
+        fDeferredInserts.pop();
+    }
+}
+
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 static inline uint32_t get_area(const SkIRect& rect) {