Added zone tracing

src/zone/zone.cc

Index: src/zone/zone.cc
diff --git a/src/zone/zone.cc b/src/zone/zone.cc
index fd0b14733cd21f5d55e9eef95b0143b5f14d400f..7228081d7d75825d362229d5a28c4f2312700373 100644
--- a/src/zone/zone.cc
+++ b/src/zone/zone.cc
@@ -41,15 +41,20 @@ const size_t kASanRedzoneBytes = 0;
 
 }  // namespace
 
-Zone::Zone(AccountingAllocator* allocator)
+Zone::Zone(AccountingAllocator* allocator, const char* name)
     : allocation_size_(0),
       segment_bytes_allocated_(0),
       position_(0),
       limit_(0),
       allocator_(allocator),
-      segment_head_(nullptr) {}
+      segment_head_(nullptr),
+      name_(name) {
+  allocator_->ZoneCreation(this);
+}
 
 Zone::~Zone() {
+  allocator_->ZoneDestruction(this);
+
   DeleteAll();
 
   DCHECK(segment_bytes_allocated_ == 0);