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

ash/host/ash_remote_window_tree_host_win.cc

Index: ash/host/ash_remote_window_tree_host_win.cc
diff --git a/ash/host/ash_remote_window_tree_host_win.cc b/ash/host/ash_remote_window_tree_host_win.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f3191b5eda025a7b7d9fdeca211cd7d1b07224e6
--- /dev/null
+++ b/ash/host/ash_remote_window_tree_host_win.cc
@@ -0,0 +1,71 @@
+// Copyright 2014 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 "ash/host/ash_remote_window_tree_host_win.h"
+
+#include "ash/host/root_window_transformer.h"
+#include "ash/ime/input_method_event_handler.h"
+#include "ui/events/event_processor.h"
+#include "ui/gfx/geometry/insets.h"
+#include "ui/gfx/transform.h"
+
+namespace ash {
+
+AshRemoteWindowTreeHostWin::AshRemoteWindowTreeHostWin(HWND remote_hwnd)
+    : aura::RemoteWindowTreeHostWin(),
+      transformer_helper_(this) {
+  SetRemoteWindowHandle(remote_hwnd);
+  transformer_helper_.Init();
+}
+
+AshRemoteWindowTreeHostWin::~AshRemoteWindowTreeHostWin() {}
+
+void AshRemoteWindowTreeHostWin::ToggleFullScreen() {}
+
+bool AshRemoteWindowTreeHostWin::ConfineCursorToRootWindow() { return false; }
+
+void AshRemoteWindowTreeHostWin::UnConfineCursor() {}
+
+void AshRemoteWindowTreeHostWin::SetRootWindowTransformer(
+    scoped_ptr<RootWindowTransformer> transformer) {
+  transformer_helper_.SetRootWindowTransformer(transformer.Pass());
+}
+
+gfx::Insets AshRemoteWindowTreeHostWin::GetHostInsets() const {
+  return gfx::Insets();
+}
+
+aura::WindowTreeHost* AshRemoteWindowTreeHostWin::AsWindowTreeHost() {
+  return this;
+}
+
+gfx::Transform AshRemoteWindowTreeHostWin::GetRootTransform() const {
+  return transformer_helper_.GetTransform();
+}
+
+void AshRemoteWindowTreeHostWin::SetRootTransform(
+    const gfx::Transform& transform) {
+  transformer_helper_.SetTransform(transform);
+}
+
+gfx::Transform AshRemoteWindowTreeHostWin::GetInverseRootTransform() const {
+  return transformer_helper_.GetInverseTransform();
+}
+
+void AshRemoteWindowTreeHostWin::UpdateRootWindowSize(
+    const gfx::Size& host_size) {
+  transformer_helper_.UpdateWindowSize(host_size);
+}
+
+ui::EventDispatchDetails AshRemoteWindowTreeHostWin::DispatchKeyEventPostIME(
+    ui::KeyEvent* event) {
+  input_method_handler()->SetPostIME(true);
+  ui::EventDispatchDetails details =
+      event_processor()->OnEventFromSource(event);
+  if (!details.dispatcher_destroyed)
+    input_method_handler()->SetPostIME(false);
+  return details;
+}
+
+}  // namespace ash