Add Search+Shift+H as global shortcut to toggle high contrast mode.

ash/common/accelerators/accelerator_table.cc

Index: ash/common/accelerators/accelerator_table.cc
diff --git a/ash/common/accelerators/accelerator_table.cc b/ash/common/accelerators/accelerator_table.cc
index 9d811195449eec6fd59c6c59a94c0fbab8559305..194ac530862cf51ced1639ebe7190888b9cc23ee 100644
--- a/ash/common/accelerators/accelerator_table.cc
+++ b/ash/common/accelerators/accelerator_table.cc
@@ -72,9 +72,8 @@ const AcceleratorData kAcceleratorData[] = {
      TOUCH_HUD_CLEAR},
     {true, ui::VKEY_P, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
      TOUCH_HUD_PROJECTION_TOGGLE},
-    // Accessibility: Spoken feedback shortcuts. The first one is to toggle
-    // spoken feedback on or off. The others are only valid when
-    // spoken feedback is enabled.
+    {false, ui::VKEY_H, ui::EF_COMMAND_DOWN | ui::EF_SHIFT_DOWN,
+     TOGGLE_HIGH_CONTRAST},
     {true, ui::VKEY_Z, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
      TOGGLE_SPOKEN_FEEDBACK},
     {true, ui::VKEY_OEM_COMMA, ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
@@ -340,6 +339,7 @@ const AcceleratorAction kActionsAllowedAtLoginOrLockScreen[] = {
     KEYBOARD_BRIGHTNESS_DOWN,
     KEYBOARD_BRIGHTNESS_UP,
     TOGGLE_CAPS_LOCK,
+    TOGGLE_HIGH_CONTRAST,
     TOGGLE_SPOKEN_FEEDBACK,
     TOGGLE_MIRROR_MODE,
     TOGGLE_WIFI,
@@ -403,6 +403,7 @@ const AcceleratorAction kActionsAllowedAtModalWindow[] = {
     SUSPEND,
     SWAP_PRIMARY_DISPLAY,
     TOGGLE_CAPS_LOCK,
+    TOGGLE_HIGH_CONTRAST,
     TOGGLE_MIRROR_MODE,
     TOGGLE_SPOKEN_FEEDBACK,
     TOGGLE_WIFI,
@@ -465,6 +466,7 @@ const AcceleratorAction kActionsAllowedInAppModeOrPinnedMode[] = {
     POWER_RELEASED,
     SWAP_PRIMARY_DISPLAY,
     TOGGLE_CAPS_LOCK,
+    TOGGLE_HIGH_CONTRAST,
     TOGGLE_MIRROR_MODE,
     TOGGLE_SPOKEN_FEEDBACK,
     TOGGLE_WIFI,
@@ -528,6 +530,7 @@ const AcceleratorAction kActionsKeepingMenuOpen[] = {
     KEYBOARD_BRIGHTNESS_UP,
     TOGGLE_APP_LIST,
     TOGGLE_CAPS_LOCK,
+    TOGGLE_HIGH_CONTRAST,
     TOGGLE_SPOKEN_FEEDBACK,
     TOGGLE_WIFI,
     VOLUME_DOWN,