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

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index dd8f2685bc37115638f5332ddbefd42a79c16cea..e6e7ccfe06c9eb13280dd7d8d826cd44df2667d0 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -3805,6 +3805,9 @@ typedef void (*FatalErrorCallback)(const char* location, const char* message);
 
 typedef void (*MessageCallback)(Handle<Message> message, Handle<Value> error);
 
+// --- Tracing ---
+
+typedef void (*LogEventCallback)(const char* name, int event);
 
 /**
  * Create new error objects by calling the corresponding error object
@@ -4395,6 +4398,9 @@ class V8_EXPORT V8 {
   /** Set the callback to invoke in case of fatal errors. */
   static void SetFatalErrorHandler(FatalErrorCallback that);
 
+  /** Set the callback to invoke in case of a timer tracing event. */
+  static void SetEventLogger(LogEventCallback that);
+
   /**
    * Set the callback to invoke to check if code generation from
    * strings should be allowed.