Tablet-like power button behavior on Convertible/Tablet ChromeOS devices

ash/shell.cc

Index: ash/shell.cc
diff --git a/ash/shell.cc b/ash/shell.cc
index 9c211fc9360204fee838b499d6369311d6cd65a8..c992a548c761c601982ebd944f940e562673cbfa 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -126,6 +126,7 @@
 #include "ash/display/screen_orientation_controller_chromeos.h"
 #include "ash/sticky_keys/sticky_keys_controller.h"
 #include "ash/system/chromeos/power/power_event_observer.h"
+#include "ash/system/chromeos/power/tablet_power_button_controller.h"
 #include "ash/system/chromeos/power/video_activity_notifier.h"
 #include "ash/touch/touch_transformer_controller.h"
 #include "ash/virtual_keyboard_controller.h"
@@ -514,6 +515,9 @@ Shell::~Shell() {
   toplevel_window_event_handler_.reset();
   visibility_controller_.reset();
 
+#if defined(OS_CHROMEOS)
+  tablet_power_button_controller_.reset();
+#endif
   power_button_controller_.reset();
   lock_state_controller_.reset();
 
@@ -823,6 +827,8 @@ void Shell::Init(const ShellInitParams& init_params) {
   bluetooth_notification_controller_.reset(new BluetoothNotificationController);
   screen_orientation_controller_.reset(new ScreenOrientationController());
   screen_layout_observer_.reset(new ScreenLayoutObserver());
+  tablet_power_button_controller_.reset(
+      new TabletPowerButtonController(lock_state_controller_.get()));
 #endif
   // The compositor thread and main message loop have to be running in
   // order to create mirror window. Run it after the main message loop