Adding field to tell if gin::IsolateHolder needs lock to be accessed.

net/proxy/proxy_resolver_v8.cc

 // Copyright (c) 2012 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 "net/proxy/proxy_resolver_v8.h"
 
 #include <algorithm>
 #include <cstdio>
 
 #include "base/basictypes.h"
@@ skipping 358 matching lines @@
         gin::V8Initializer::LoadV8Snapshot();
 #endif
 
         gin::IsolateHolder::Initialize(
             gin::IsolateHolder::kNonStrictMode,
             gin::ArrayBufferAllocator::SharedInstance());
 
         has_initialized_v8_ = true;
       }
 
-      holder_.reset(new gin::IsolateHolder);
+      holder_.reset(new gin::IsolateHolder(gin::IsolateHolder::kLockToAccess));
     }
 
     return holder_->isolate();
   }
 
   v8::Isolate* GetSharedIsolateWithoutCreating() {
     base::AutoLock l(lock_);
     return holder_ ? holder_->isolate() : NULL;
   }
 
@@ skipping 498 matching lines @@
     return 0;
 
   v8::Locker locked(isolate);
   v8::Isolate::Scope isolate_scope(isolate);
   v8::HeapStatistics heap_statistics;
   isolate->GetHeapStatistics(&heap_statistics);
   return heap_statistics.used_heap_size();
 }
 
 }  // namespace net