When an Isolate is configured to use lockers, foreground tasks need to lock

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>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "gin/gin_export.h"
+#include "gin/public/isolate_holder.h"
 #include "gin/public/v8_idle_task_runner.h"
 #include "gin/public/wrapper_info.h"
 #include "v8/include/v8.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace gin {
 
 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);
+  PerIsolateData(v8::Isolate* isolate,
+                 v8::ArrayBuffer::Allocator* allocator,
+                 IsolateHolder::AccessMode access_mode);
   ~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 24 matching lines @@
 
   void EnableIdleTasks(std::unique_ptr<V8IdleTaskRunner> idle_task_runner);
 
   v8::Isolate* isolate() { return isolate_; }
   v8::ArrayBuffer::Allocator* allocator() { return allocator_; }
   base::SingleThreadTaskRunner* task_runner() { return task_runner_.get(); }
   V8IdleTaskRunner* idle_task_runner() {
     return idle_task_runner_.get();
   }
 
+  IsolateHolder::AccessMode access_mode() const { return access_mode_; }
+
  private:
   typedef std::map<
       WrapperInfo*, v8::Eternal<v8::ObjectTemplate> > ObjectTemplateMap;
   typedef std::map<
       WrapperInfo*, v8::Eternal<v8::FunctionTemplate> > FunctionTemplateMap;
   typedef std::map<WrappableBase*, IndexedPropertyInterceptor*>
       IndexedPropertyInterceptorMap;
   typedef std::map<WrappableBase*, NamedPropertyInterceptor*>
       NamedPropertyInterceptorMap;
 
   // PerIsolateData doesn't actually own |isolate_|. Instead, the isolate is
   // owned by the IsolateHolder, which also owns the PerIsolateData.
   v8::Isolate* isolate_;
   v8::ArrayBuffer::Allocator* allocator_;
+  IsolateHolder::AccessMode access_mode_;
   ObjectTemplateMap object_templates_;
   FunctionTemplateMap function_templates_;
   IndexedPropertyInterceptorMap indexed_interceptors_;
   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_