Track live instance and allocation counts for classes

runtime/vm/isolate.cc

Index: runtime/vm/isolate.cc
diff --git a/runtime/vm/isolate.cc b/runtime/vm/isolate.cc
index cecc08880845240fa35fe75df2ce7389b0f2a72b..efe0fc4f37f29975040269be3435967a4db94079 100644
--- a/runtime/vm/isolate.cc
+++ b/runtime/vm/isolate.cc
@@ -16,6 +16,7 @@
 #include "vm/debugger.h"
 #include "vm/deopt_instructions.h"
 #include "vm/heap.h"
+#include "vm/heap_class_stats.h"
 #include "vm/heap_histogram.h"
 #include "vm/message_handler.h"
 #include "vm/object_id_ring.h"
@@ -44,6 +45,7 @@ DEFINE_FLAG(bool, trace_isolates, false,
 void Isolate::RegisterClass(const Class& cls) {
   class_table()->Register(cls);
   if (object_histogram() != NULL) object_histogram()->RegisterClass(cls);
+  if (heap_class_stats() != NULL) heap_class_stats()->RegisterClass(cls);
 }
 
 
@@ -307,11 +309,13 @@ Isolate::Isolate()
       stack_frame_index_(-1),
       object_histogram_(NULL),
       object_id_ring_(NULL),
+      heap_class_stats_(NULL),
       REUSABLE_HANDLE_LIST(REUSABLE_HANDLE_INITIALIZERS)
       reusable_handles_() {
   if (FLAG_print_object_histogram && (Dart::vm_isolate() != NULL)) {
     object_histogram_ = new ObjectHistogram(this);
   }
+  heap_class_stats_ = new HeapClassStatistics(this);
 }
 #undef REUSABLE_HANDLE_INITIALIZERS
 
@@ -332,6 +336,7 @@ Isolate::~Isolate() {
   message_handler_ = NULL;  // Fail fast if we send messages to a dead isolate.
   ASSERT(deopt_context_ == NULL);  // No deopt in progress when isolate deleted.
   delete object_histogram_;
+  delete heap_class_stats_;
 }
 
 void Isolate::SetCurrent(Isolate* current) {