chromeos: Makes mushrome use simplified display management

ash/mus/ash_window_tree_host_mus.cc

Index: ash/mus/ash_window_tree_host_mus.cc
diff --git a/ash/mus/ash_window_tree_host_mus.cc b/ash/mus/ash_window_tree_host_mus.cc
new file mode 100644
index 0000000000000000000000000000000000000000..52cb894ff83f132650fd420151375c2b34959af9
--- /dev/null
+++ b/ash/mus/ash_window_tree_host_mus.cc
@@ -0,0 +1,87 @@
+// Copyright 2017 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/mus/ash_window_tree_host_mus.h"
+
+#include "ash/host/root_window_transformer.h"
+#include "ash/host/transformer_helper.h"
+#include "base/memory/ptr_util.h"
+#include "ui/aura/mus/window_tree_host_mus_init_params.h"
+#include "ui/aura/window.h"
+#include "ui/events/null_event_targeter.h"
+
+namespace ash {
+
+AshWindowTreeHostMus::AshWindowTreeHostMus(
+    aura::WindowTreeHostMusInitParams init_params)
+    : aura::WindowTreeHostMus(std::move(init_params)),
+      transformer_helper_(base::MakeUnique<TransformerHelper>(this)) {
+  transformer_helper_->Init();
+}
+
+AshWindowTreeHostMus::~AshWindowTreeHostMus() {}
+
+void AshWindowTreeHostMus::ToggleFullScreen() {
+  NOTIMPLEMENTED();
+}
+
+bool AshWindowTreeHostMus::ConfineCursorToRootWindow() {
+  // TODO: when implementing see implementation in AshWindowTreeHostPlatform
+  // for how it uses |transformer_helper_|.
+  NOTIMPLEMENTED();
+  return true;
+}
+
+void AshWindowTreeHostMus::UnConfineCursor() {
+  NOTIMPLEMENTED();
+}
+
+void AshWindowTreeHostMus::SetRootWindowTransformer(
+    std::unique_ptr<RootWindowTransformer> transformer) {
+  transformer_helper_->SetRootWindowTransformer(std::move(transformer));
+  ConfineCursorToRootWindow();
+}
+
+gfx::Insets AshWindowTreeHostMus::GetHostInsets() const {
+  return transformer_helper_->GetHostInsets();
+}
+
+aura::WindowTreeHost* AshWindowTreeHostMus::AsWindowTreeHost() {
+  return this;
+}
+
+void AshWindowTreeHostMus::PrepareForShutdown() {
+  // WindowEventDispatcher may have pending events that need to be processed.
+  // At the time this function is called the WindowTreeHost and Window are in
+  // a semi-shutdown state. Reset the targeter so that the current targeter
+  // doesn't attempt to process events while in this state, which would likely
+  // crash.
+  std::unique_ptr<ui::NullEventTargeter> null_event_targeter =
+      base::MakeUnique<ui::NullEventTargeter>();
+  window()->SetEventTargeter(std::move(null_event_targeter));
+}
+
+void AshWindowTreeHostMus::RegisterMirroringHost(
+    AshWindowTreeHost* mirroring_ash_host) {
+  NOTIMPLEMENTED();
+}
+
+void AshWindowTreeHostMus::SetRootTransform(const gfx::Transform& transform) {
+  transformer_helper_->SetTransform(transform);
+}
+
+gfx::Transform AshWindowTreeHostMus::GetRootTransform() const {
+  return transformer_helper_->GetTransform();
+}
+
+gfx::Transform AshWindowTreeHostMus::GetInverseRootTransform() const {
+  return transformer_helper_->GetInverseTransform();
+}
+
+void AshWindowTreeHostMus::UpdateRootWindowSizeInPixels(
+    const gfx::Size& host_size_in_pixels) {
+  transformer_helper_->UpdateWindowSize(host_size_in_pixels);
+}
+
+}  // namespace ash