Revert of Remove remote tree host and some related input and metro_driver code

chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.h

Index: chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.h
diff --git a/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.h b/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.h
new file mode 100644
index 0000000000000000000000000000000000000000..9696a490fc83adaa72a12c3dde3ff647edfb13ee
--- /dev/null
+++ b/chrome/browser/metro_viewer/chrome_metro_viewer_process_host_aurawin.h
@@ -0,0 +1,37 @@
+// Copyright 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 CHROME_BROWSER_METRO_VIEWER_CHROME_METRO_VIEWER_PROCESS_HOST_AURAWIN_H_
+#define CHROME_BROWSER_METRO_VIEWER_CHROME_METRO_VIEWER_PROCESS_HOST_AURAWIN_H_
+
+#include <stdint.h>
+
+#include "base/macros.h"
+#include "win8/viewer/metro_viewer_process_host.h"
+
+namespace base {
+class FilePath;
+}
+
+class ChromeMetroViewerProcessHost : public win8::MetroViewerProcessHost {
+ public:
+  ChromeMetroViewerProcessHost();
+  ~ChromeMetroViewerProcessHost() override;
+
+ private:
+  // win8::MetroViewerProcessHost implementation
+  void OnChannelError() override;
+
+  // IPC::Listener implementation
+  void OnChannelConnected(int32_t peer_pid) override;
+  void OnSetTargetSurface(gfx::NativeViewId target_surface,
+                          float device_scale) override;
+  void OnOpenURL(const base::string16& url) override;
+  void OnHandleSearchRequest(const base::string16& search_string) override;
+  void OnWindowSizeChanged(uint32_t width, uint32_t height) override;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeMetroViewerProcessHost);
+};
+
+#endif  // CHROME_BROWSER_METRO_VIEWER_CHROME_METRO_VIEWER_PROCESS_HOST_AURAWIN_H_