This reproduces on local builds; you don't need a device to be hit by this.

This happens because mushrome mode doesn't have a cursor manager. In classic mode, an AshNativeCursorManager is made which collaborates deeply with the ozone platform object. In mus mode, the views layer installs its own NativeCursorManagerMus which proxies calls to the WindowPortMus (and therefore across the mus boundary).

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/36cfb953ea04dac15159b516cd9ce741c6b7384b

commit 36cfb953ea04dac15159b516cd9ce741c6b7384b
Author: erg <erg@chromium.org>
Date: Wed Jun 21 19:41:45 2017

Implement cursor changing on Mushrome.

This splits AshNativeCursorManager into an interface and creates two
implementations: one for classic ash (the original code), and one for
mushrome. The new mushrome implementation forwards to the mus window
manager interface instead of the individual windows due to how mus gets
cursors only from windows which have event handlers.

This leaves some features unimplemented, such as cursor sets, but
implements the core interface.

BUG= 729798 , 734807 , 734809 

Review-Url: https://codereview.chromium.org/2932563002
Cr-Commit-Position: refs/heads/master@{#481278}

[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/BUILD.gn
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/display/mirror_window_controller.cc
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/shell.cc
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/shell.h
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/test/cursor_manager_test_api.cc
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/test/shell_test_api.cc
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/test/shell_test_api.h
[delete] https://crrev.com/9e737bfc5e4d818bc14f8282c4a0c241ef810c0a/ash/wm/ash_native_cursor_manager.h
[add] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash.h
[rename] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash_classic.cc
[add] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash_classic.h
[rename] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash_interactive_uitest.cc
[add] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash_mus.cc
[add] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash_mus.h
[rename] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ash/wm/native_cursor_manager_ash_unittest.cc
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/chrome/test/BUILD.gn
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/extensions/shell/browser/shell_desktop_controller_aura.cc
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/testing/buildbot/filters/ash_unittests_mash.filter
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/testing/buildbot/filters/ash_unittests_mus.filter
[modify] https://crrev.com/36cfb953ea04dac15159b516cd9ce741c6b7384b/ui/views/widget/desktop_aura/desktop_native_cursor_manager.h

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8

commit c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8
Author: erg <erg@chromium.org>
Date: Fri Jun 23 21:37:47 2017

Implement large cursors in Mushrome.

This transitions a ui enum to an enum class, and adds support for
sending it across mojo pipes. The window manager now has an API to
change which cursor set is used on the window server.

BUG= 729798 

Review-Url: https://codereview.chromium.org/2949353003
Cr-Commit-Position: refs/heads/master@{#482038}

[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/aura/shell_port_classic.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/aura/shell_port_classic.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/display/cursor_window_controller.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/display/cursor_window_controller.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/mus/bridge/shell_port_mash.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/mus/bridge/shell_port_mash.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/shell_port.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/test/cursor_manager_test_api.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/test/cursor_manager_test_api.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/utility/screenshot_controller_unittest.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/wm/native_cursor_manager_ash_classic.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/wm/native_cursor_manager_ash_classic.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/wm/native_cursor_manager_ash_mus.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/wm/native_cursor_manager_ash_mus.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/wm/native_cursor_manager_ash_unittest.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ash/wm/window_manager_unittest.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/chrome/browser/chromeos/accessibility/accessibility_manager.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/chrome/browser/chromeos/arc/accessibility/arc_accessibility_helper_bridge_unittest.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/pointer.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/pointer.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/wm_helper.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/wm_helper.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/wm_helper_ash.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/wm_helper_ash.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/wm_helper_mus.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/components/exo/wm_helper_mus.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/extensions/shell/browser/shell_desktop_controller_aura.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/public/interfaces/cursor/cursor.mojom
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/public/interfaces/cursor/cursor.typemap
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/public/interfaces/cursor/cursor_struct_traits.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/public/interfaces/cursor/cursor_struct_traits.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/public/interfaces/window_manager.mojom
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/cursor_state.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/cursor_state.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/display.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/display.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/platform_display.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/platform_display_default.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/platform_display_default.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/test_utils.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/window_tree.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/services/ui/ws/window_tree.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/testing/buildbot/filters/ash_unittests_mash.filter
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/testing/buildbot/filters/ash_unittests_mus.filter
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/client/cursor_client.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/client/cursor_client_observer.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/mus/window_manager_delegate.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/mus/window_tree_client.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/mus/window_tree_client.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/test/mus/test_window_manager_client.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/test/mus/test_window_manager_client.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/test/test_cursor_client.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/aura/test/test_cursor_client.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/BUILD.gn
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/cursor.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/cursor_loader_x11.cc
[add] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/cursor_type.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/cursors_aura.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/cursors_aura.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/image_cursors.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/base/cursor/image_cursors.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/views/mus/desktop_window_tree_host_mus.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/views/widget/desktop_aura/desktop_native_cursor_manager.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/views/widget/desktop_aura/desktop_native_cursor_manager.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/core/cursor_manager.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/core/cursor_manager.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/core/cursor_manager_unittest.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/core/native_cursor_manager.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/core/native_cursor_manager_delegate.h
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/test/testing_cursor_client_observer.cc
[modify] https://crrev.com/c5323f29ddb3f7fa2f1752c2d9edca50dfd3bde8/ui/wm/test/testing_cursor_client_observer.h

 Issue 705592  has been merged into this issue.