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

Adds a V8.Execute histogram to measure the amount of time spent executing
JS code.

BUG=v8:4865
LOG=N

Review-Url: https://codereview.chromium.org/1974003002
Cr-Commit-Position: refs/heads/master@{#36217}

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");
@@ -4379,6 +4380,7 @@ 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);
@@ -4406,6 +4408,7 @@ 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);
@@ -4456,6 +4459,7 @@ 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);
@@ -4480,6 +4484,7 @@ 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);

src/counters.h

@@ -700,6 +700,8 @@ class RuntimeCallTimerScope {
      MICROSECOND)                                                              \
   /* Total compilation time incl. caching/parsing */                           \
   HT(compile_script, V8.CompileScriptMicroSeconds, 1000000, MICROSECOND)       \
+  /* Total JavaScript execution time (including callbacks and runtime calls */ \
+  HT(execute, V8.Execute, 1000000, MICROSECOND)                                \
   /* Asm/Wasm */                                                               \
   HT(wasm_instantiate_module_time, V8.WasmInstantiateModuleMicroSeconds,       \
      1000000, MICROSECOND)                                                     \