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

test/cctest/test-api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 22098 matching lines @@
 Local<Object> ApiCallOptimizationChecker::holder;
 Local<Object> ApiCallOptimizationChecker::callee;
 int ApiCallOptimizationChecker::count = 0;
 
 
 TEST(TestFunctionCallOptimization) {
   i::FLAG_allow_natives_syntax = true;
   ApiCallOptimizationChecker checker;
   checker.RunAll();
 }
+
+
+static const char* last_event_message;
+static int last_event_status;
+void StoringEventLoggerCallback(const char* message, int status) {
+    last_event_message = message;
+    last_event_status = status;
+}
+
+
+TEST(EventLogging) {
+  LocalContext env;
+  v8::V8::SetEventLogger(StoringEventLoggerCallback);
+  v8::internal::HistogramTimer* histogramTimer =
+      new v8::internal::HistogramTimer(
+          "V8.Test", 0, 10000, 50,
+          reinterpret_cast<v8::internal::Isolate*>(env->GetIsolate()));
+  histogramTimer->Start();
+  CHECK_EQ("V8.Test", last_event_message);
+  CHECK_EQ(0, last_event_status);
+  histogramTimer->Stop();
+  CHECK_EQ("V8.Test", last_event_message);
+  CHECK_EQ(1, last_event_status);
+}