Add Ctrl+Alt+H as global shortcut to toggle high contrast mode.

ash/common/accelerators/accelerator_controller.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/common/accelerators/accelerator_controller.h"
 
 #include "ash/common/accelerators/accelerator_commands.h"
 #include "ash/common/accelerators/accelerator_controller_delegate.h"
 #include "ash/common/accelerators/debug_commands.h"
 #include "ash/common/accessibility_delegate.h"
@@ skipping 448 matching lines @@
 }
 
 void HandleToggleCapsLock() {
   base::RecordAction(UserMetricsAction("Accel_Toggle_Caps_Lock"));
   chromeos::input_method::InputMethodManager* ime =
       chromeos::input_method::InputMethodManager::Get();
   chromeos::input_method::ImeKeyboard* keyboard = ime->GetImeKeyboard();
   keyboard->SetCapsLockEnabled(!keyboard->CapsLockIsEnabled());
 }
 
+void HandleToggleHighContrast() {

[James Cook, 2016/09/20 21:37:13]

Thanks for keeping the functions alphabetized.

+  base::RecordAction(UserMetricsAction("Accel_Toggle_High_Contrast"));
+
+  WmShell::Get()->accessibility_delegate()->ToggleHighContrast();
+}
+
 void HandleToggleSpokenFeedback() {
   base::RecordAction(UserMetricsAction("Accel_Toggle_Spoken_Feedback"));
 
   WmShell::Get()->accessibility_delegate()->ToggleSpokenFeedback(
       A11Y_NOTIFICATION_SHOW);
 }
 
 void HandleVolumeDown(const ui::Accelerator& accelerator) {
   VolumeControlDelegate* volume_delegate =
       WmShell::Get()->system_tray_delegate()->GetVolumeControlDelegate();
@@ skipping 340 matching lines @@
 #if defined(OS_CHROMEOS)
     case BRIGHTNESS_DOWN:
     case BRIGHTNESS_UP:
     case KEYBOARD_BRIGHTNESS_DOWN:
     case KEYBOARD_BRIGHTNESS_UP:
     case OPEN_CROSH:
     case OPEN_FILE_MANAGER:
     case OPEN_GET_HELP:
     case SHOW_IME_MENU_BUBBLE:
     case SUSPEND:
+    case TOGGLE_HIGH_CONTRAST:
     case TOGGLE_SPOKEN_FEEDBACK:
     case TOGGLE_WIFI:
     case VOLUME_DOWN:
     case VOLUME_MUTE:
     case VOLUME_UP:
 #else
     case DUMMY_FOR_RESERVED:
 #endif
       return true;
 
@@ skipping 197 matching lines @@
       break;
     case SWITCH_TO_NEXT_USER:
       HandleCycleUser(SessionStateDelegate::CYCLE_TO_NEXT_USER);
       break;
     case SWITCH_TO_PREVIOUS_USER:
       HandleCycleUser(SessionStateDelegate::CYCLE_TO_PREVIOUS_USER);
       break;
     case TOGGLE_CAPS_LOCK:
       HandleToggleCapsLock();
       break;
+    case TOGGLE_HIGH_CONTRAST:
+      HandleToggleHighContrast();
+      break;
     case TOGGLE_SPOKEN_FEEDBACK:
       HandleToggleSpokenFeedback();
       break;
     case TOGGLE_WIFI:
       WmShell::Get()->system_tray_notifier()->NotifyRequestToggleWifi();
       break;
     case VOLUME_DOWN:
       HandleVolumeDown(accelerator);
       break;
     case VOLUME_MUTE:
@@ skipping 57 matching lines @@
   if (wm_shell->mru_window_tracker()->BuildMruWindowList().empty() &&
       actions_needing_window_.find(action) != actions_needing_window_.end()) {
     wm_shell->accessibility_delegate()->TriggerAccessibilityAlert(
         A11Y_ALERT_WINDOW_NEEDED);
     return RESTRICTION_PREVENT_PROCESSING_AND_PROPAGATION;
   }
   return RESTRICTION_NONE;
 }
 
 }  // namespace ash