Use timer task runner for V8PerIsolate tasks

gin/isolate_holder.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/public/isolate_holder.h"
 
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include <memory>
 #include <utility>
 
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "base/sys_info.h"
 #include "gin/debug_impl.h"
 #include "gin/function_template.h"
 #include "gin/per_isolate_data.h"
 #include "gin/run_microtasks_observer.h"
 #include "gin/v8_initializer.h"
 #include "gin/v8_isolate_memory_dump_provider.h"
 
 namespace gin {
 
 namespace {
 v8::ArrayBuffer::Allocator* g_array_buffer_allocator = nullptr;
 }  // namespace
 
-IsolateHolder::IsolateHolder() : IsolateHolder(AccessMode::kSingleThread) {
-}
+IsolateHolder::IsolateHolder(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
+    : IsolateHolder(std::move(task_runner), AccessMode::kSingleThread) {}
 
-IsolateHolder::IsolateHolder(AccessMode access_mode)
+IsolateHolder::IsolateHolder(
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+    AccessMode access_mode)
     : access_mode_(access_mode) {
   v8::ArrayBuffer::Allocator* allocator = g_array_buffer_allocator;
   CHECK(allocator) << "You need to invoke gin::IsolateHolder::Initialize first";
   v8::Isolate::CreateParams params;
   params.entry_hook = DebugImpl::GetFunctionEntryHook();
   params.code_event_handler = DebugImpl::GetJitCodeEventHandler();
   params.constraints.ConfigureDefaults(base::SysInfo::AmountOfPhysicalMemory(),
                                        base::SysInfo::AmountOfVirtualMemory());
   params.array_buffer_allocator = allocator;
   isolate_ = v8::Isolate::New(params);
-  isolate_data_.reset(new PerIsolateData(isolate_, allocator, access_mode));
+  isolate_data_.reset(
+      new PerIsolateData(isolate_, allocator, access_mode, task_runner));
   isolate_memory_dump_provider_.reset(new V8IsolateMemoryDumpProvider(this));
 #if defined(OS_WIN)
   {
     void* code_range;
     size_t size;
     isolate_->GetCodeRange(&code_range, &size);
     Debug::CodeRangeCreatedCallback callback =
         DebugImpl::GetCodeRangeCreatedCallback();
     if (code_range && size && callback)
       callback(code_range, size);
@@ skipping 42 matching lines @@
   task_observer_.reset();
 }
 
 void IsolateHolder::EnableIdleTasks(
     std::unique_ptr<V8IdleTaskRunner> idle_task_runner) {
   DCHECK(isolate_data_.get());
   isolate_data_->EnableIdleTasks(std::move(idle_task_runner));
 }
 
 }  // namespace gin