chromeos: adds TouchDeviceServer and wires up in mushrome

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 864802ad9feef8bb842d6f78656bb4b725c3c1fb..314024d96d652627116e233e8772c03f145fa547 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -156,6 +156,7 @@
 #include "ui/display/manager/chromeos/default_touch_transform_setter.h"
 #include "ui/display/manager/chromeos/display_change_observer.h"
 #include "ui/display/manager/chromeos/display_configurator.h"
+#include "ui/display/manager/chromeos/touch_transform_setter.h"
 #include "ui/display/manager/display_manager.h"
 #include "ui/display/screen.h"
 #include "ui/display/types/native_display_delegate.h"
@@ -326,6 +327,11 @@ void Shell::RegisterPrefs(PrefRegistrySimple* registry) {
   NightLightController::RegisterPrefs(registry);
 }
 
+// static
+bool Shell::ShouldEnableSimplifiedDisplayManagement() {
+  return GetAshConfig() != Config::MASH;
+}
+
 views::NonClientFrameView* Shell::CreateDefaultNonClientFrameView(
     views::Widget* widget) {
   // Use translucent-style window frames for dialogs.
@@ -1057,11 +1063,11 @@ void Shell::Init(const ShellInitParams& init_params) {
   // WindowTreeHostManager::InitDisplays()
   // since AshTouchTransformController listens on
   // WindowTreeHostManager::Observer::OnDisplaysInitialized().
-  // TODO(sky): needs to to work for mus too.
-  if (config == Config::CLASSIC) {
-    touch_transformer_controller_.reset(new AshTouchTransformController(
-        display_configurator_.get(), display_manager_.get(),
-        base::MakeUnique<display::DefaultTouchTransformSetter>()));
+  if (ShouldEnableSimplifiedDisplayManagement()) {
+    touch_transformer_controller_ =
+        base::MakeUnique<AshTouchTransformController>(
+            display_configurator_.get(), display_manager_.get(),
+            shell_port_->CreateTouchTransformDelegate());
   }
 
   keyboard_ui_ = shell_port_->CreateKeyboardUI();