Use timer task runner for V8PerIsolate tasks

gin/per_isolate_data.h

 // 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.
 
 #ifndef GIN_PER_ISOLATE_DATA_H_
 #define GIN_PER_ISOLATE_DATA_H_
 
 #include <map>
 #include <memory>
 
@@ skipping 14 matching lines @@
 class IndexedPropertyInterceptor;
 class NamedPropertyInterceptor;
 class WrappableBase;
 
 // There is one instance of PerIsolateData per v8::Isolate managed by Gin. This
 // class stores all the Gin-related data that varies per isolate.
 class GIN_EXPORT PerIsolateData {
  public:
   PerIsolateData(v8::Isolate* isolate,
                  v8::ArrayBuffer::Allocator* allocator,
-                 IsolateHolder::AccessMode access_mode);
+                 IsolateHolder::AccessMode access_mode,
+                 scoped_refptr<base::SingleThreadTaskRunner> task_runner);
   ~PerIsolateData();
 
   static PerIsolateData* From(v8::Isolate* isolate);
 
   // Each isolate is associated with a collection of v8::ObjectTemplates and
   // v8::FunctionTemplates. Typically these template objects are created
   // lazily.
   void SetObjectTemplate(WrapperInfo* info,
                          v8::Local<v8::ObjectTemplate> object_template);
   void SetFunctionTemplate(WrapperInfo* info,
@@ skipping 54 matching lines @@
   NamedPropertyInterceptorMap named_interceptors_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   std::unique_ptr<V8IdleTaskRunner> idle_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(PerIsolateData);
 };
 
 }  // namespace gin
 
 #endif  // GIN_PER_ISOLATE_DATA_H_