Make the v8 Isolate used in the proxy resolver explicit.

net/proxy/proxy_resolver_v8.h

 // Copyright (c) 2011 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 NET_PROXY_PROXY_RESOLVER_V8_H_
 #define NET_PROXY_PROXY_RESOLVER_V8_H_
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "net/base/net_export.h"
 #include "net/proxy/proxy_resolver.h"
 
+namespace v8 {
+class Isolate;
+}  // namespace v8
+
 namespace net {
 
 // Implementation of ProxyResolver that uses V8 to evaluate PAC scripts.
 //
 // ----------------------------------------------------------------------------
 // !!! Important note on threading model:
 // ----------------------------------------------------------------------------
 // There can be only one instance of V8 running at a time. To enforce this
 // constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore
 // it is OK to run multiple instances of ProxyResolverV8 on different threads,
@@ skipping 55 matching lines @@
                              RequestHandle* /*request*/,
                              const BoundNetLog& net_log) OVERRIDE;
   virtual void CancelRequest(RequestHandle request) OVERRIDE;
   virtual LoadState GetLoadState(RequestHandle request) const OVERRIDE;
   virtual void CancelSetPacScript() OVERRIDE;
   virtual void PurgeMemory() OVERRIDE;
   virtual int SetPacScript(
       const scoped_refptr<ProxyResolverScriptData>& script_data,
       const net::CompletionCallback& /*callback*/) OVERRIDE;
 
+  // Remember the default Isolate, must be called from the main thread. This
+  // hack can be removed when the "default Isolate" concept is gone.
+  static void RememberDefaultIsolate();
+  static v8::Isolate* GetDefaultIsolate();
+
  private:
+  static v8::Isolate* g_default_isolate_;
+
   // Context holds the Javascript state for the most recently loaded PAC
   // script. It corresponds with the data from the last call to
   // SetPacScript().
   class Context;
 
   scoped_ptr<Context> context_;
 
   JSBindings* js_bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_V8_H_