[Merge] Make mouse buttons 8 - 11 navigate forward and back in history

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 <string.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/XKBlib.h>
@@ skipping 143 matching lines @@
   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;
+  // There are no masks for EF_BACK_MOUSE_BUTTON and
+  // EF_FORWARD_MOUSE_BUTTON.
   return flags;
 }
 
 int GetEventFlagsFromXKeyEvent(XEvent* xevent) {
   DCHECK(xevent->type == KeyPress || xevent->type == KeyRelease);
 
 #if defined(OS_CHROMEOS)
   const int ime_fabricated_flag = 0;
 #else
   // XIM fabricates key events for the character compositions by XK_Multi_key.
@@ skipping 43 matching lines @@
 // event, |state| would have Button1Mask set but not Button3Mask, and |button|
 // would be 3.
 int GetEventFlagsForButton(int button) {
   switch (button) {
     case 1:
       return ui::EF_LEFT_MOUSE_BUTTON;
     case 2:
       return ui::EF_MIDDLE_MOUSE_BUTTON;
     case 3:
       return ui::EF_RIGHT_MOUSE_BUTTON;
+    case 8:
+      return ui::EF_BACK_MOUSE_BUTTON;
+    case 9:
+      return ui::EF_FORWARD_MOUSE_BUTTON;
     default:
       return 0;
   }
 }
 
 int GetButtonMaskForX2Event(XIDeviceEvent* xievent) {
   int buttonflags = 0;
   for (int i = 0; i < 8 * xievent->buttons.mask_len; i++) {
     if (XIMaskIsSet(xievent->buttons.mask, i)) {
       int button = (xievent->sourceid == xievent->deviceid) ?
@@ skipping 665 matching lines @@
       xievent->detail =
           UpdateX11EventButton(event->changed_button_flags(), xievent->detail);
       break;
     }
     default:
       break;
   }
 }
 
 }  // namespace ui