Never lock the Pepper proxy lock on the IO thread

ppapi/proxy/ppapi_proxy_test.h

 // 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 <map>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/synchronization/waitable_event.h"
+#include "base/task_runner.h"
 #include "base/threading/simple_thread.h"
 #include "base/threading/thread.h"
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/proxy/host_dispatcher.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
 #include "ppapi/proxy/plugin_globals.h"
 #include "ppapi/proxy/plugin_proxy_delegate.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/proxy/resource_message_test_sink.h"
@@ skipping 135 matching lines @@
    private:
     base::MessageLoopProxy* ipc_message_loop_;  // Weak
     base::WaitableEvent* shutdown_event_;  // Weak
     std::set<PP_Instance> instance_id_set_;
     IPC::Sender* browser_sender_;
 
     DISALLOW_COPY_AND_ASSIGN(PluginDelegateMock);
   };
 
  private:
-  void CreatePluginGlobals();
+  void CreatePluginGlobals(
+      const scoped_refptr<base::TaskRunner>& ipc_task_runner);
 
   GlobalsConfiguration globals_config_;
   scoped_ptr<PluginGlobals> plugin_globals_;
 
   scoped_ptr<PluginDispatcher> plugin_dispatcher_;
   PluginDelegateMock plugin_delegate_mock_;
 };
 
 class PluginProxyTest : public PluginProxyTestHarness, public testing::Test {
  public:
@@ skipping 184 matching lines @@
 //   EXPECT_VAR_IS_STRING("foo", my_var);
 #define EXPECT_VAR_IS_STRING(str, var) { \
   StringVar* sv = StringVar::FromPPVar(var); \
   EXPECT_TRUE(sv); \
   if (sv) \
     EXPECT_EQ(str, sv->value()); \
 }
 
 }  // namespace proxy
 }  // namespace ppapi