Add parallel recompilation time to histogram and plot execution pause times.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 042f4775cf2087c832660f6e121ece3e2e531df1..b90a2e63a0a0eaef8f9ab2bdbf1fe07a344d1612 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1681,6 +1681,7 @@ Local<Value> Script::Run() {
   ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
   LOG_API(isolate, "Script::Run");
   ENTER_V8(isolate);
+  i::Logger::TimerEventScope timer_scope(isolate->logger(), "V8.ScriptRun");
   i::Object* raw_result = NULL;
   {
     i::HandleScope scope(isolate);