Handle X11 Mod3Mask for Caps Lock remapping.

ui/events/x/events_x.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 "ui/events/event_constants.h"
 
 #include <cmath>
 #include <string.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
@@ skipping 119 matching lines @@
 int GetEventFlagsFromXState(unsigned int state) {
   int flags = 0;
   if (state & ControlMask)
     flags |= ui::EF_CONTROL_DOWN;
   if (state & ShiftMask)
     flags |= ui::EF_SHIFT_DOWN;
   if (state & Mod1Mask)
     flags |= ui::EF_ALT_DOWN;
   if (state & LockMask)
     flags |= ui::EF_CAPS_LOCK_DOWN;
+  if (state & Mod3Mask)
+    flags |= ui::EF_MOD3_DOWN;
   if (state & Mod4Mask)
     flags |= ui::EF_COMMAND_DOWN;
   if (state & Mod5Mask)
     flags |= ui::EF_ALTGR_DOWN;
   if (state & Button1Mask)
     flags |= ui::EF_LEFT_MOUSE_BUTTON;
   if (state & Button2Mask)
     flags |= ui::EF_MIDDLE_MOUSE_BUTTON;
   if (state & Button3Mask)
     flags |= ui::EF_RIGHT_MOUSE_BUTTON;
@@ skipping 554 matching lines @@
   DeviceDataManager::GetInstance()->GetGestureTimes(
       native_event, start_time, end_time);
   return true;
 }
 
 bool IsTouchpadEvent(const base::NativeEvent& event) {
   return DeviceDataManager::GetInstance()->IsTouchpadXInputEvent(event);
 }
 
 }  // namespace ui