Use timer task runner for V8PerIsolate tasks

gin/per_isolate_data.cc

 // Copyright 2013 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/per_isolate_data.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "gin/public/gin_embedders.h"
 
 using v8::ArrayBuffer;
 using v8::Eternal;
 using v8::Isolate;
 using v8::Local;
 using v8::Object;
 using v8::FunctionTemplate;
 using v8::ObjectTemplate;
 
 namespace gin {
 
-PerIsolateData::PerIsolateData(Isolate* isolate,
-                               ArrayBuffer::Allocator* allocator,
-                               IsolateHolder::AccessMode access_mode)
+PerIsolateData::PerIsolateData(
+    Isolate* isolate,
+    ArrayBuffer::Allocator* allocator,
+    IsolateHolder::AccessMode access_mode,
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
     : isolate_(isolate),
       allocator_(allocator),
       access_mode_(access_mode),
-      task_runner_(base::ThreadTaskRunnerHandle::Get()) {
+      task_runner_(task_runner) {
   isolate_->SetData(kEmbedderNativeGin, this);
 }
 
 PerIsolateData::~PerIsolateData() {
   isolate_->SetData(kEmbedderNativeGin, NULL);
 }
 
 PerIsolateData* PerIsolateData::From(Isolate* isolate) {
   return static_cast<PerIsolateData*>(isolate->GetData(kEmbedderNativeGin));
 }
@@ skipping 73 matching lines @@
   else
     return NULL;
 }
 
 void PerIsolateData::EnableIdleTasks(
     std::unique_ptr<V8IdleTaskRunner> idle_task_runner) {
   idle_task_runner_ = std::move(idle_task_runner);
 }
 
 }  // namespace gin