[heap] Improve size profiling for ArrayBuffer tracking

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 7320be3ad2f44cc3b5599ab674b9c49893aafe13..cfad5a0ddfe2b9209ff5818db4f0dd408eaaf398 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -163,7 +163,8 @@ Heap::Heap()
       deserialization_complete_(false),
       strong_roots_list_(NULL),
       heap_iterator_depth_(0),
-      force_oom_(false) {
+      force_oom_(false),
+      array_buffer_tracker_(nullptr) {
 // Allow build-time customization of the max semispace size. Building
 // V8 with snapshots and a non-default max semispace size is much
 // easier if you can define it as part of the build environment.
@@ -1717,7 +1718,7 @@ void Heap::Scavenge() {
   // Set age mark.
   new_space_.set_age_mark(new_space_.top());
 
-  ArrayBufferTracker::FreeDeadInNewSpace(this);
+  array_buffer_tracker()->FreeDeadInNewSpace(this);
 
   // Update how much has survived scavenge.
   IncrementYoungSurvivorsCounter(static_cast<int>(
@@ -2003,12 +2004,12 @@ HeapObject* Heap::DoubleAlignForDeserialization(HeapObject* object, int size) {
 
 
 void Heap::RegisterNewArrayBuffer(JSArrayBuffer* buffer) {
-  ArrayBufferTracker::RegisterNew(this, buffer);
+  array_buffer_tracker()->RegisterNew(this, buffer);
 }
 
 
 void Heap::UnregisterArrayBuffer(JSArrayBuffer* buffer) {
-  ArrayBufferTracker::Unregister(this, buffer);
+  array_buffer_tracker()->Unregister(this, buffer);
 }
 
 
@@ -5357,6 +5358,8 @@ bool Heap::SetUp() {
       *this, ScavengeJob::kBytesAllocatedBeforeNextIdleTask);
   new_space()->AddAllocationObserver(idle_scavenge_observer_);
 
+  array_buffer_tracker_ = new ArrayBufferTracker(this);
+
   return true;
 }
 
@@ -5557,6 +5560,9 @@ void Heap::TearDown() {
   delete store_buffer_;
   store_buffer_ = nullptr;
 
+  delete array_buffer_tracker_;
+  array_buffer_tracker_ = nullptr;
+
   delete memory_allocator_;
   memory_allocator_ = nullptr;
 }