Revert of gpu: Completely remove GpuProcessHostUIShim.

content/browser/gpu/gpu_process_host_ui_shim.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_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
+#define CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_
+
+// This class lives on the UI thread and supports classes like the
+// BackingStoreProxy, which must live on the UI thread. The IO thread
+// portion of this class, the GpuProcessHost, is responsible for
+// shuttling messages between the browser and GPU processes.
+
+#include <stdint.h>
+
+#include <string>
+
+#include "base/callback.h"
+#include "base/compiler_specific.h"
+#include "base/memory/linked_ptr.h"
+#include "base/memory/ref_counted.h"
+#include "base/threading/non_thread_safe.h"
+#include "build/build_config.h"
+#include "content/common/content_export.h"
+#include "gpu/config/gpu_info.h"
+#include "gpu/ipc/common/memory_stats.h"
+#include "ipc/ipc_listener.h"
+#include "ipc/ipc_sender.h"
+#include "ipc/message_router.h"
+
+namespace IPC {
+class Message;
+}
+
+namespace service_manager {
+class BinderRegistry;
+}
+
+namespace content {
+void RouteToGpuProcessHostUIShimTask(int host_id, const IPC::Message& msg);
+
+class GpuProcessHostUIShim : public base::NonThreadSafe {
+ public:
+  // Create a GpuProcessHostUIShim with the given ID.  The object can be found
+  // using FromID with the same id.
+  static GpuProcessHostUIShim* Create(int host_id);
+
+  // Destroy the GpuProcessHostUIShim with the given host ID. This can only
+  // be called on the UI thread. Only the GpuProcessHost should destroy the
+  // UI shim.
+  static void Destroy(int host_id, const std::string& message);
+
+  CONTENT_EXPORT static GpuProcessHostUIShim* FromID(int host_id);
+
+  // The GpuProcessHost causes this to be called on the UI thread to
+  // dispatch the incoming messages from the GPU process, which are
+  // actually received on the IO thread.
+  void OnMessageReceived(const IPC::Message& message);
+
+  // Register Mojo interfaces that must be bound on the UI thread.
+  static void RegisterUIThreadMojoInterfaces(
+      service_manager::BinderRegistry* registry);
+
+ private:
+  explicit GpuProcessHostUIShim(int host_id);
+  ~GpuProcessHostUIShim();
+
+  // The serial number of the GpuProcessHost / GpuProcessHostUIShim pair.
+  int host_id_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_GPU_GPU_PROCESS_HOST_UI_SHIM_H_