Introduce a way to grab heap stats.

src/heap-profiler.cc

Index: src/heap-profiler.cc
diff --git a/src/heap-profiler.cc b/src/heap-profiler.cc
index 8be6f27685e97135b3720c101aed25abed646342..cda1a878e632ba25e3515263e19c216cb08aaeac 100644
--- a/src/heap-profiler.cc
+++ b/src/heap-profiler.cc
@@ -33,7 +33,6 @@
 namespace v8 {
 namespace internal {
 
-
 HeapProfiler::HeapProfiler()
     : snapshots_(new HeapSnapshotsCollection()),
       next_snapshot_uid_(1) {
@@ -86,6 +85,24 @@ HeapSnapshot* HeapProfiler::TakeSnapshot(String* name,
 }
 
 
+void HeapProfiler::StartHeapObjectsTracking() {
+  ASSERT(Isolate::Current()->heap_profiler() != NULL);
+  Isolate::Current()->heap_profiler()->StartHeapObjectsTrackingImpl();
+}
+
+
+void HeapProfiler::StopHeapObjectsTracking() {
+  ASSERT(Isolate::Current()->heap_profiler() != NULL);
+  Isolate::Current()->heap_profiler()->StopHeapObjectsTrackingImpl();
+}
+
+
+void HeapProfiler::PushHeapObjectsStats(v8::OutputStream* stream) {
+  ASSERT(Isolate::Current()->heap_profiler() != NULL);
+  return Isolate::Current()->heap_profiler()->PushHeapObjectsStatsImpl(stream);
+}
+
+
 void HeapProfiler::DefineWrapperClass(
     uint16_t class_id, v8::HeapProfiler::WrapperInfoCallback callback) {
   ASSERT(class_id != v8::HeapProfiler::kPersistentHandleNoClassId);
@@ -136,6 +153,20 @@ HeapSnapshot* HeapProfiler::TakeSnapshotImpl(String* name,
   return TakeSnapshotImpl(snapshots_->names()->GetName(name), type, control);
 }
 
+void HeapProfiler::StartHeapObjectsTrackingImpl() {
+  snapshots_->StartHeapObjectsTracking();
+}
+
+
+void HeapProfiler::PushHeapObjectsStatsImpl(OutputStream* stream) {
+  snapshots_->PushHeapObjectsStats(stream);
+}
+
+
+void HeapProfiler::StopHeapObjectsTrackingImpl() {
+  snapshots_->StopHeapObjectsTracking();
+}
+
 
 int HeapProfiler::GetSnapshotsCount() {
   HeapProfiler* profiler = Isolate::Current()->heap_profiler();