Ignore EnterNotify and ExitNotify events from NativeViewGlSurfaceGLX's window.

ui/aura/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/aura/window_tree_host_x11.h"
 
 #include <strings.h>
 #include <X11/cursorfont.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/Xrandr.h>
@@ skipping 314 matching lines @@
 uint32_t WindowTreeHostX11::DispatchEvent(const ui::PlatformEvent& event) {
   XEvent* xev = event;
   if (FindEventTarget(xev) == x_root_window_) {
     if (xev->type == GenericEvent)
       DispatchXI2Event(xev);
     return ui::POST_DISPATCH_NONE;
   }
 
   switch (xev->type) {
     case EnterNotify: {
+      // Ignore EventNotify events from children of |xwindow_|.
+      // NativeViewGLSurfaceGLX adds a child to |xwindow_|.
+      // TODO(pkotwicz|tdanderson): Figure out whether the suppression is
+      // necessary. crbug.com/385716
+      if (xev->xcrossing.detail == NotifyInferior)
+        break;
+
       aura::Window* root_window = window();
       client::CursorClient* cursor_client =
           client::GetCursorClient(root_window);
       if (cursor_client) {
         const gfx::Display display = gfx::Screen::GetScreenFor(root_window)->
             GetDisplayNearestWindow(root_window);
         cursor_client->SetDisplay(display);
       }
       ui::MouseEvent mouse_event(xev);
       // EnterNotify creates ET_MOUSE_MOVE. Mark as synthesized as this is not
       // real mouse move event.
       mouse_event.set_flags(mouse_event.flags() | ui::EF_IS_SYNTHESIZED);
       TranslateAndDispatchLocatedEvent(&mouse_event);
       break;
     }
     case LeaveNotify: {
+      // Ignore LeaveNotify events from children of |xwindow_|.
+      // NativeViewGLSurfaceGLX adds a child to |xwindow_|.
+      // TODO(pkotwicz|tdanderson): Figure out whether the suppression is
+      // necessary. crbug.com/385716
+      if (xev->xcrossing.detail == NotifyInferior)
+        break;
+
       ui::MouseEvent mouse_event(xev);
       TranslateAndDispatchLocatedEvent(&mouse_event);
       break;
     }
     case Expose: {
       gfx::Rect damage_rect(xev->xexpose.x, xev->xexpose.y,
                             xev->xexpose.width, xev->xexpose.height);
       compositor()->ScheduleRedrawRect(damage_rect);
       break;
     }
@@ skipping 360 matching lines @@
 }
 
 namespace test {
 
 void SetUseOverrideRedirectWindowByDefault(bool override_redirect) {
   default_override_redirect = override_redirect;
 }
 
 }  // namespace test
 }  // namespace aura