Add shortcut keys to ui scaling

ash/ash_switches.cc

 // Copyright (c) 2012 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/ash_switches.h"
 
 namespace ash {
 namespace switches {
 
 // Enables an animated transition from the boot splash screen (Chrome logo on a
@@ skipping 43 matching lines @@
 // Disable new network handlers in the status area.
 const char kAshDisableNewNetworkStatusArea[] =
     "ash-disable-new-network-status-area";
 
 // Disable the per application grouping version of the launcher.
 const char kAshDisablePerAppLauncher[] = "ash-disable-per-app-launcher";
 
 // Disables immersive fullscreen mode.
 const char kAshDisableImmersiveMode[] = "ash-disable-immersive-mode";
 
+// Disables display rotation.
+const char kAshDisableDisplayRotation[] = "ash-disable-display-rotation";
+
+// Disables ui scaling.
+const char kAshDisableUIScaling[] = "ash-disable-ui-scaling";
+
 // Enable advanced gestures (e.g. for window management).
 const char kAshEnableAdvancedGestures[] = "ash-enable-advanced-gestures";
 
 // Always enable brightness control. Used by machines that don't report their
 // main monitor as internal.
 const char kAshEnableBrightnessControl[] = "ash-enable-brightness-control";
 
 // Enable the experiment to show all browser tabs in the browser menu of the
 // launcher.
 const char kAshEnableFullBrowserListInLauncher[] =
@@ skipping 43 matching lines @@
 const char kAshTouchHud[] = "ash-touch-hud";
 
 // (Most) Chrome OS hardware reports ACPI power button releases correctly.
 // Standard hardware reports releases immediately after presses.  If set, we
 // lock the screen or shutdown the system immediately in response to a press
 // instead of displaying an interactive animation.
 const char kAuraLegacyPowerButton[] = "aura-legacy-power-button";
 
 }  // namespace switches
 }  // namespace ash