X11: Add TestDesktopScreenX11 to simulate mouse movement in ui tests

ui/views/BUILD.gn

Index: ui/views/BUILD.gn
diff --git a/ui/views/BUILD.gn b/ui/views/BUILD.gn
index eb265087f51750ffed4edb3103dd021472415a2d..05dce4defc99805aa6c7a0914155cf2122fc357e 100644
--- a/ui/views/BUILD.gn
+++ b/ui/views/BUILD.gn
@@ -750,6 +750,8 @@ static_library("test_support_internal") {
       sources += [
         "test/desktop_screen_x11_test_api.cc",
         "test/desktop_screen_x11_test_api.h",
+        "test/test_desktop_screen_x11.cc",

[sky, 2016/09/09 15:25:35]

test_support_internal isn't visible outside of ui/views. You need to move this,
most likely to test_support.

[Tom (Use chromium acct), 2016/09/09 21:23:16]

The tests were alerady able to link
but ok, done

[Tom (Use chromium acct), 2016/09/09 21:45:40]

ERROR at //ui/views/test/ui_controls_factory_desktop_aurax11.cc:28:11: Include
not allowed.
#include "ui/views/test/test_desktop_screen_x11.h"
          ^--------------------------------------
It is not in any dependency of
  //ui/views:test_support_internal
The include file is in the target(s):
  //ui/views:test_support
which should somehow be reachable.

[sky, 2016/09/09 22:21:02]

Sorry, I think the way you had it is right. I missed that 'test_support' has a
public_dep on this. So, keep the file in test_support_internal.

+        "test/test_desktop_screen_x11.h",
         "test/ui_controls_factory_desktop_aurax11.cc",
         "test/ui_controls_factory_desktop_aurax11.h",
       ]