Add Box object to heap profiler.

test/cctest/test-heap-profiler.cc

Index: test/cctest/test-heap-profiler.cc
diff --git a/test/cctest/test-heap-profiler.cc b/test/cctest/test-heap-profiler.cc
index 026dfbc7da2e92124ad5164f7410206f9d4a8508..ae0ade411646222e4e53af622d621725cee22c37 100644
--- a/test/cctest/test-heap-profiler.cc
+++ b/test/cctest/test-heap-profiler.cc
@@ -2359,3 +2359,37 @@ TEST(ArrayBufferAndArrayBufferView) {
       GetProperty(arr1_buffer, v8::HeapGraphEdge::kWeak, "weak_first_view");
   CHECK_NE(NULL, first_view);
 }
+
+
+TEST(BoxObject) {
+  LocalContext env;
+  v8::HandleScope scope(env->GetIsolate());
+  v8::HeapProfiler* heap_profiler = env->GetIsolate()->GetHeapProfiler();
+  CompileRun("1");
+  const v8::HeapSnapshot* snapshot =
+      heap_profiler->TakeHeapSnapshot(v8_str("snapshot"));
+  CHECK(ValidateSnapshot(snapshot));
+  const v8::HeapGraphNode* global = GetGlobalObject(snapshot);
+  const v8::HeapGraphNode* properties =
+      GetProperty(global, v8::HeapGraphEdge::kInternal, "properties");
+  int num_objects = properties->GetChildrenCount();
+  int i;
+  for (i = 0; i < num_objects; ++i) {
+    const v8::HeapGraphEdge* prop = properties->GetChild(i);
+    const v8::HeapGraphNode* node = prop->GetToNode();
+    v8::String::Utf8Value node_name(node->GetName());
+    if (strcmp(*node_name, "system / PropertyCell") != 0)
+      continue;
+    const v8::HeapGraphNode* type_node =
+        GetProperty(node, v8::HeapGraphEdge::kInternal, "type");
+    CHECK_NE(NULL, type_node);
+    v8::String::Utf8Value type_node_name(type_node->GetName());
+    if (strcmp(*type_node_name, "system / Box") != 0)

[yurys, 2014/01/30 13:34:34]

This looks a bit fragile, would it be enough to set a number from native code
and then check that it is boxed?

+      continue;
+    const v8::HeapGraphNode* box_value =
+        GetProperty(type_node, v8::HeapGraphEdge::kInternal, "value");
+    CHECK_NE(NULL, box_value);
+    break;
+  }
+  CHECK_NE(num_objects, i);
+}