Report memory retained by memory allocator internals.

webkit/glue/webkitplatformsupport_impl.cc

Index: webkit/glue/webkitplatformsupport_impl.cc
diff --git a/webkit/glue/webkitplatformsupport_impl.cc b/webkit/glue/webkitplatformsupport_impl.cc
index dfa8a43b6f38f2be38f31b273f0916064314abe5..c688b5d615151e383a81198c56c48ea601dde760 100644
--- a/webkit/glue/webkitplatformsupport_impl.cc
+++ b/webkit/glue/webkitplatformsupport_impl.cc
@@ -12,6 +12,7 @@
 
 #include <vector>
 
+#include "base/allocator/allocator_extension.h"
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/memory/scoped_ptr.h"
@@ -831,6 +832,10 @@ bool WebKitPlatformSupportImpl::processMemorySizesInBytes(
   return CurrentProcessMetrics()->GetMemoryBytes(private_bytes, shared_bytes);
 }
 
+bool WebKitPlatformSupportImpl::memoryAllocatorWasteInBytes(size_t* size) {
+  return base::allocator::GetAllocatorWasteSize(size);
+}
+
 void WebKitPlatformSupportImpl::SuspendSharedTimer() {
   ++shared_timer_suspended_;
 }