Improve the OOME fragmentation message.

Change-Id: I390d3622f8d572ec7e34ea6dff9e1e0936e81ac1
diff --git a/runtime/gc/space/rosalloc_space.h b/runtime/gc/space/rosalloc_space.h
index 2934af8..f505305 100644
--- a/runtime/gc/space/rosalloc_space.h
+++ b/runtime/gc/space/rosalloc_space.h
@@ -120,6 +120,10 @@
 
   virtual ~RosAllocSpace();
 
+  void LogFragmentationAllocFailure(std::ostream& os, size_t failed_alloc_bytes) OVERRIDE {
+    rosalloc_->LogFragmentationAllocFailure(os, failed_alloc_bytes);
+  }
+
  protected:
   RosAllocSpace(const std::string& name, MemMap* mem_map, allocator::RosAlloc* rosalloc,
                 byte* begin, byte* end, byte* limit, size_t growth_limit, bool can_move_objects,