Add GCTracer metrics for a scavenger GC for DOM wrappers

src/heap.h

Index: src/heap.h
diff --git a/src/heap.h b/src/heap.h
index c5af4d02e2fa3a05c9d9d03701462fc023e9f2bd..38766ea8a5ecd970dd49b1b7d4d464393bb2aa3f 100644
--- a/src/heap.h
+++ b/src/heap.h
@@ -2557,6 +2557,18 @@ class GCTracer BASE_EMBEDDED {
     promoted_objects_size_ += object_size;
   }
 
+  void increment_died_nodes_in_new_space() {
+    died_nodes_in_new_space_++;
+  }
+
+  void increment_copied_nodes_in_new_space() {
+    copied_nodes_in_new_space_++;
+  }
+
+  void increment_promoted_nodes() {
+    promoted_nodes_++;
+  }
+
  private:
   // Returns a string matching the collector.
   const char* CollectorString();
@@ -2601,6 +2613,15 @@ class GCTracer BASE_EMBEDDED {
   // Size of objects promoted during the current collection.
   intptr_t promoted_objects_size_;
 
+  // Number of died nodes in the new space.
+  int died_nodes_in_new_space_;

[Michael Starzinger, 2012/12/05 14:26:14]

Can we rename this to "nodes_died_in_new_space_" so that it is using a common
prefix for all the global-handle related counters.

[haraken, 2012/12/06 11:08:15]

Done.

+
+  // Number of copied nodes to the new space.
+  int copied_nodes_in_new_space_;

[Michael Starzinger, 2012/12/05 14:26:14]

Likewise with "nodes_copied_in_new_space_".

[haraken, 2012/12/06 11:08:15]

Done.

+
+  // Number of promoted nodes to the old space.
+  int promoted_nodes_;

[Michael Starzinger, 2012/12/05 14:26:14]

Likewise with "nodes_promoted_"

[haraken, 2012/12/06 11:08:15]

Done.

+
   // Incremental marking steps counters.
   int steps_count_;
   double steps_took_;