Fix windows build

content/renderer/gpu/gpu_channel_host.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.
 
 #ifndef CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_
 #define CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process_util.h"
 #include "base/synchronization/lock.h"
+#include "content/common/content_export.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
 #include "content/common/message_router.h"
 #include "content/public/common/gpu_info.h"
 #include "content/renderer/gpu/gpu_video_decode_accelerator_host.h"
 #include "ipc/ipc_channel_handle.h"
 #include "ipc/ipc_channel_proxy.h"
 #include "ipc/ipc_sync_channel.h"
 #include "ui/gfx/gl/gpu_preference.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
@@ skipping 13 matching lines @@
 }
 
 struct GpuListenerInfo {
   GpuListenerInfo();
   ~GpuListenerInfo();
 
   base::WeakPtr<IPC::Channel::Listener> listener;
   scoped_refptr<base::MessageLoopProxy> loop;
 };
 
-class GpuChannelHostFactory {
+class CONTENT_EXPORT GpuChannelHostFactory {
  public:
   virtual ~GpuChannelHostFactory();
   static GpuChannelHostFactory* instance() { return instance_; }
 
   virtual bool IsMainThread() = 0;
   virtual bool IsIOThread() = 0;
   virtual MessageLoop* GetMainLoop() = 0;
   virtual base::MessageLoopProxy* GetIOLoopProxy() = 0;
   virtual base::WaitableEvent* GetShutDownEvent() = 0;
   virtual scoped_ptr<base::SharedMemory> AllocateSharedMemory(uint32 size) = 0;
@@ skipping 137 matching lines @@
   // for calls from contexts that may live on the compositor or main thread.
   mutable base::Lock context_lock_;
 
   // A filter for sending messages from thread other than the main thread.
   scoped_refptr<IPC::SyncMessageFilter> sync_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 #endif  // CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_