Add a hang monitor for Pepper plugins

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/message_loop.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 180 matching lines @@
     virtual base::WaitableEvent* GetShutdownEvent();
 
    private:
     base::MessageLoopProxy* ipc_message_loop_;  // Weak
     base::WaitableEvent* shutdown_event_;  // Weak
 
     DISALLOW_COPY_AND_ASSIGN(DelegateMock);
   };
 
  private:
+  class MockSyncMessageStatusReceiver;
+
   ppapi::TestGlobals host_globals_;
   scoped_ptr<HostDispatcher> host_dispatcher_;
   DelegateMock delegate_mock_;
+
+  scoped_ptr<MockSyncMessageStatusReceiver> status_receiver_;
 };
 
 class HostProxyTest : public HostProxyTestHarness, public testing::Test {
  public:
   HostProxyTest();
   virtual ~HostProxyTest();
 
   // testing::Test implementation.
   virtual void SetUp();
   virtual void TearDown();
@@ skipping 38 matching lines @@
   // stopping the harnesses.
   ProxyTestHarnessBase* remote_harness_;
   ProxyTestHarnessBase* local_harness_;
 
   base::WaitableEvent channel_created_;
   base::WaitableEvent shutdown_event_;
 };
 
 }  // namespace proxy
 }  // namespace ppapi