Implement AggregatableHistogramTimer and use it to measure how much time

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 1462 matching lines @@
 
 Local<Value> Script::Run() {
   i::Handle<i::Object> obj = Utils::OpenHandle(this, true);
   // If execution is terminating, Compile(..)->Run() requires this
   // check.
   if (obj.is_null()) return Local<Value>();
   i::Isolate* isolate = i::Handle<i::HeapObject>::cast(obj)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Script::Run()", return Local<Value>());
   LOG_API(isolate, "Script::Run");
   ENTER_V8(isolate);
+  i::AggregatingHistogramTimerScope timer(isolate->counters()->compile_lazy());
   i::TimerEventScope<i::TimerEventExecute> timer_scope(isolate);
   i::HandleScope scope(isolate);
   i::Handle<i::JSFunction> fun = i::Handle<i::JSFunction>::cast(obj);
   EXCEPTION_PREAMBLE(isolate);
   i::Handle<i::Object> receiver(isolate->global_proxy(), isolate);
   i::Handle<i::Object> result;
   has_pending_exception = !i::Execution::Call(
       isolate, fun, receiver, 0, NULL).ToHandle(&result);
   EXCEPTION_BAILOUT_CHECK_DO_CALLBACK(isolate, Local<Value>());
   return Utils::ToLocal(scope.CloseAndEscape(result));
@@ skipping 6101 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal