Merge r9430, r9433 and r9508 into 3.5 branch.

src/api.cc

Index: src/api.cc
===================================================================
--- src/api.cc	(revision 9618)
+++ src/api.cc	(working copy)
@@ -5766,6 +5766,16 @@
 }
 
 
+v8::Handle<v8::Value> HeapGraphNode::GetHeapValue() const {
+  i::Isolate* isolate = i::Isolate::Current();
+  IsDeadCheck(isolate, "v8::HeapGraphNode::GetHeapValue");
+  i::Handle<i::HeapObject> object = ToInternal(this)->GetHeapObject();
+  return v8::Handle<Value>(!object.is_null() ?
+                           ToApi<Value>(object) : ToApi<Value>(
+                               isolate->factory()->undefined_value()));
+}
+
+
 static i::HeapSnapshot* ToInternal(const HeapSnapshot* snapshot) {
   return const_cast<i::HeapSnapshot*>(
       reinterpret_cast<const i::HeapSnapshot*>(snapshot));