Add support for allowing an embedder to get the V8 profile timer event logs.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 2c7db3be1656f10d475dd8e1de71a89ed374cdd6..1698ab6cafa7f5cb2c1e6b100b084477a70ed398 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -6421,6 +6421,11 @@ void Isolate::GetHeapStatistics(HeapStatistics* heap_statistics) {
 }
 
 
+void Isolate::SetEventLogger(LogEventCallback that) {
+  i::Isolate* isolate = reinterpret_cast<i::Isolate*>(this);
+  isolate->set_event_logger(that);
+}
+
 String::Utf8Value::Utf8Value(v8::Handle<v8::Value> obj)
     : str_(NULL), length_(0) {
   i::Isolate* isolate = i::Isolate::Current();