Handle XI_Enter and XI_Leave events.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 2041 matching lines @@
       if (!factory->ShouldProcessXI2Event(xev))
         break;
 
       XIEnterEvent* enter_event = static_cast<XIEnterEvent*>(xev->xcookie.data);
       switch (static_cast<XIEvent*>(xev->xcookie.data)->evtype) {
         case XI_Enter:
         case XI_Leave:
           OnCrossingEvent(enter_event->evtype == XI_Enter, enter_event->focus,
                           XI2ModeToXMode(enter_event->mode),
                           enter_event->detail);
-          break;
+          return ui::POST_DISPATCH_STOP_PROPAGATION;
         case XI_FocusIn:
         case XI_FocusOut:
           OnFocusEvent(enter_event->evtype == XI_FocusIn,
                        XI2ModeToXMode(enter_event->mode), enter_event->detail);
-          break;
+          return ui::POST_DISPATCH_STOP_PROPAGATION;
         default:
           break;
       }
 
       ui::EventType type = ui::EventTypeFromNative(xev);
       XEvent last_event;
       int num_coalesced = 0;
 
       switch (type) {
         case ui::ET_TOUCH_MOVED:
@@ skipping 230 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeThemeAura::instance();
 }
 
 }  // namespace views