Add V8.Execute histogram to measure time spent executing JS code.

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 4f1d7348ca3fbbbccebb99aec9550e03c71a99b8..6332e1f6dc678794be12a882ed343e0e9d2285a0 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1783,6 +1783,7 @@ Local<Value> UnboundScript::GetSourceMappingURL() {
 
 MaybeLocal<Value> Script::Run(Local<Context> context) {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Script::Run()", Value)
+  i::HistogramTimerScope execute_timer(isolate->counters()->execute());
   i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   TRACE_EVENT0("v8", "V8.Execute");
@@ -4373,6 +4374,7 @@ MaybeLocal<Value> Object::CallAsFunction(Local<Context> context,
                                          Local<Value> argv[]) {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Object::CallAsFunction()",
                                       Value);
+  i::HistogramTimerScope execute_timer(isolate->counters()->execute());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
@@ -4400,6 +4402,7 @@ MaybeLocal<Value> Object::CallAsConstructor(Local<Context> context, int argc,
                                             Local<Value> argv[]) {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context,
                                       "v8::Object::CallAsConstructor()", Value);
+  i::HistogramTimerScope execute_timer(isolate->counters()->execute());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
@@ -4450,6 +4453,7 @@ MaybeLocal<Object> Function::NewInstance(Local<Context> context, int argc,
                                          v8::Local<v8::Value> argv[]) const {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Function::NewInstance()",
                                       Object);
+  i::HistogramTimerScope execute_timer(isolate->counters()->execute());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);
@@ -4474,6 +4478,7 @@ MaybeLocal<v8::Value> Function::Call(Local<Context> context,
                                      v8::Local<v8::Value> recv, int argc,
                                      v8::Local<v8::Value> argv[]) {
   PREPARE_FOR_EXECUTION_WITH_CALLBACK(context, "v8::Function::Call()", Value);
+  i::HistogramTimerScope execute_timer(isolate->counters()->execute());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   TRACE_EVENT0("v8", "V8.Execute");
   auto self = Utils::OpenHandle(this);