Mark the ET_MOUSE_MOVED created from a pointer grab as synthesized.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 1414ba2b760f7f74b9b46760140480fd749f78c3..c2e1a19e0aaebdb9ccab2e03e8891bdb8573bded 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -1918,6 +1918,10 @@ uint32_t DesktopWindowTreeHostX11::DispatchEvent(
       // NativeViewGLSurfaceGLX adds a child to |xwindow_|.
       if (xev->xcrossing.detail != NotifyInferior) {
         ui::MouseEvent mouse_event(xev);
+        // EnterNotify creates ET_MOUSE_MOVED. Mark as synthesized as this is
+        // not a real mouse move event.
+        if (xev->type == EnterNotify)
+          mouse_event.set_flags(mouse_event.flags() | ui::EF_IS_SYNTHESIZED);

[sadrul, 2017/06/16 16:03:36]

Looks like we are always doing this [1, 2]. Can we instead update [3] so we
don't need to explicitly do this?

[1]
https://cs.chromium.org/chromium/src/ui/platform_window/x11/x11_window.cc?l=94
[2]
https://cs.chromium.org/chromium/src/ui/events/platform/x11/x11_event_source_...
[3] https://cs.chromium.org/chromium/src/ui/events/x/events_x_utils.cc?l=478

[Kevin McNee, 2017/06/29 22:41:42]

Done.

         DispatchMouseEvent(&mouse_event);
       }
       break;