Use TaskScheduler instead of WorkerPool in v8_platform.cc.

gin/v8_platform.cc

 // Copyright 2014 The Chromium 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 "gin/public/v8_platform.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/sys_info.h"
-#include "base/threading/worker_pool.h"
+#include "base/task_scheduler/post_task.h"
 #include "base/trace_event/trace_event.h"
 #include "gin/per_isolate_data.h"
 
 namespace gin {
 
 namespace {
 
 base::LazyInstance<V8Platform>::Leaky g_v8_platform = LAZY_INSTANCE_INITIALIZER;
 
 void RunWithLocker(v8::Isolate* isolate, v8::Task* task) {
@@ skipping 29 matching lines @@
 V8Platform::V8Platform() {}
 
 V8Platform::~V8Platform() {}
 
 size_t V8Platform::NumberOfAvailableBackgroundThreads() {
   // WorkerPool will currently always create additional threads for posted
   // background tasks, unless there are threads sitting idle (on posix).
   // Indicate that V8 should create no more than the number of cores available,
   // reserving one core for the main thread.
   const size_t available_cores =
     static_cast<size_t>(base::SysInfo::NumberOfProcessors());

[jochen (gone - plz use gerrit), 2017/01/24 14:30:12]

can you update this to return the max. number of threads?

[fdoray, 2017/02/03 17:20:01]

Done.

   if (available_cores > 1) {
     return available_cores - 1;
   }
   return 1;
 }
 
 void V8Platform::CallOnBackgroundThread(
     v8::Task* task,
     v8::Platform::ExpectedRuntime expected_runtime) {
-  base::WorkerPool::PostTask(
-      FROM_HERE,
-      base::Bind(&v8::Task::Run, base::Owned(task)),
-      expected_runtime == v8::Platform::kLongRunningTask);
+  base::PostTaskWithTraits(
+      FROM_HERE, base::TaskTraits().WithShutdownBehavior(
+                     base::TaskShutdownBehavior::CONTINUE_ON_SHUTDOWN),
+      base::Bind(&v8::Task::Run, base::Owned(task)));
 }
 
 void V8Platform::CallOnForegroundThread(v8::Isolate* isolate, v8::Task* task) {
   PerIsolateData* data = PerIsolateData::From(isolate);
   if (data->access_mode() == IsolateHolder::kUseLocker) {
     data->task_runner()->PostTask(
         FROM_HERE, base::Bind(RunWithLocker, base::Unretained(isolate),
                               base::Owned(task)));
   } else {
     data->task_runner()->PostTask(
@@ skipping 167 matching lines @@
     v8::Platform::TraceStateObserver* observer) {
   g_trace_state_dispatcher.Get().AddObserver(observer);
 }
 
 void V8Platform::RemoveTraceStateObserver(
     v8::Platform::TraceStateObserver* observer) {
   g_trace_state_dispatcher.Get().RemoveObserver(observer);
 }
 
 }  // namespace gin