ash: Tune shutdown timer in TabletPowerButtonController and shutdown

white animation speed

Changes:
(1) shutdown_timer_ in TabletPowerButtonController changes from 1000ms to 500ms.
(2) animation_speed_shutdown is set to 2500ms for touch view enabled device case.

This change follows the new timing guideline in go/touchview-power.

BUG=633304
TEST=tested on device

Review-Url: https://codereview.chromium.org/2622103003
Cr-Commit-Position: refs/heads/master@{#443012}

ash/system/chromeos/power/tablet_power_button_controller.cc

@@ -23,7 +23,7 @@ namespace {
 
 // Amount of time the power button must be held to start the pre-shutdown
 // animation when in tablet mode.
-constexpr int kShutdownTimeoutMs = 1000;
+constexpr int kShutdownTimeoutMs = 500;
 
 // Amount of time since last SuspendDone() that power button event needs to be
 // ignored.

ash/wm/session_state_animator.cc

@@ -4,9 +4,11 @@
 
 #include "ash/wm/session_state_animator.h"
 
+#include "ash/common/ash_switches.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
 #include "ash/wm/window_animations.h"
+#include "base/command_line.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/compositor/layer_animation_observer.h"
@@ -16,6 +18,17 @@
 
 namespace ash {
 
+namespace {
+
+bool IsTouchViewEnabled() {
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+             switches::kAshEnableTouchView) ||
+         base::CommandLine::ForCurrentProcess()->HasSwitch(
+             switches::kAshEnableTouchViewTesting);
+}
+
+}  // namespace
+
 const int SessionStateAnimator::kAllLockScreenContainersMask =
     SessionStateAnimator::LOCK_SCREEN_WALLPAPER |
     SessionStateAnimator::LOCK_SCREEN_CONTAINERS |
@@ -82,7 +95,8 @@ base::TimeDelta SessionStateAnimator::GetDuration(
     case ANIMATION_SPEED_UNDO_MOVE_WINDOWS:
       return base::TimeDelta::FromMilliseconds(350);
     case ANIMATION_SPEED_SHUTDOWN:
-      return base::TimeDelta::FromMilliseconds(1000);
+      return IsTouchViewEnabled() ? base::TimeDelta::FromMilliseconds(2500)
+                                  : base::TimeDelta::FromMilliseconds(1000);
     case ANIMATION_SPEED_REVERT_SHUTDOWN:
       return base::TimeDelta::FromMilliseconds(500);
   }