[inspector] console.timeEnd formats ms in the same way as JS formats double

test/inspector/inspector-impl.cc

 // Copyright 2016 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 "test/inspector/inspector-impl.h"
 
 #include "include/v8.h"
 
 #include "src/vector.h"
 
@@ skipping 120 matching lines @@
   inspector_->contextCreated(
       v8_inspector::V8ContextInfo(context, 1, v8_inspector::StringView()));
   context_.Reset(isolate_, context);
 }
 
 v8::Local<v8::Context> InspectorClientImpl::ensureDefaultContextInGroup(int) {
   CHECK(isolate_);
   return context_.Get(isolate_);
 }
 
+void InspectorClientImpl::setCurrentTimeMSForTest(double time) {
+  current_time_ = time;
+  current_time_set_for_test_ = true;
+}
+
 double InspectorClientImpl::currentTimeMS() {
+  if (current_time_set_for_test_) return current_time_;
   return v8::base::OS::TimeCurrentMillis();
 }
 
 void InspectorClientImpl::runMessageLoopOnPause(int) {
   task_runner_->RunMessageLoop(true);
 }
 
 void InspectorClientImpl::quitMessageLoopOnPause() {
   task_runner_->QuitMessageLoop();
 }
@@ skipping 42 matching lines @@
       isolate, SendMessageToBackendExtension::SendMessageToBackend);
 }
 
 void SendMessageToBackendExtension::SendMessageToBackend(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   CHECK(backend_task_runner_);
   CHECK(args.Length() == 1 && args[0]->IsString());
   v8::Local<v8::String> message = args[0].As<v8::String>();
   backend_task_runner_->Append(new SendMessageToBackendTask(ToVector(message)));
 }