Blocked volume up/down events that originated from remapped function keys.

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 156 matching lines @@
   // We have to send these fabricated key events to XIM so it can correctly
   // handle the character compositions.
   const bool fabricated_by_xim =
       xevent->xkey.keycode == 0 && xevent->xkey.state == 0;
   const int ime_fabricated_flag =
       fabricated_by_xim ? ui::EF_IME_FABRICATED_KEY : 0;
 #endif
 
   return GetEventFlagsFromXState(xevent->xkey.state) |
       (IsKeypadKey(XLookupKeysym(&xevent->xkey, 0)) ? ui::EF_NUMPAD_KEY : 0) |
+      (IsFunctionKey(XLookupKeysym(&xevent->xkey, 0)) ?
+          ui::EF_FUNCTION_KEY : 0) |
       ime_fabricated_flag;
 }
 
 // Get the event flag for the button in XButtonEvent. During a ButtonPress
 // event, |state| in XButtonEvent does not include the button that has just been
 // pressed. Instead |state| contains flags for the buttons (if any) that had
 // already been pressed before the current button, and |button| stores the most
 // current pressed button. So, if you press down left mouse button, and while
 // pressing it down, press down the right mouse button, then for the latter
 // event, |state| would have Button1Mask set but not Button3Mask, and |button|
@@ skipping 532 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