Enable Ozone software implementation in GYP

ui/ui_unittests.gypi

Index: ui/ui_unittests.gypi
diff --git a/ui/ui_unittests.gypi b/ui/ui_unittests.gypi
index f1e876d79e93e3856704013dbb3f73111bdd1dde..cee5585dcd258170cbdaf8875564f9cffc9e2438 100644
--- a/ui/ui_unittests.gypi
+++ b/ui/ui_unittests.gypi
@@ -181,6 +181,9 @@
         'gfx/font_list_unittest.cc',
         'gfx/image/image_mac_unittest.mm',
         'gfx/image/image_util_unittest.cc',
+        'gfx/ozone/impl/hardware_display_controller_ozone_unittest.cc',
+        'gfx/ozone/impl/software_surface_factory_ozone_unittest.cc',
+        'gfx/ozone/impl/software_surface_ozone_unittest.cc',
         'gfx/platform_font_mac_unittest.mm',
         'gfx/render_text_unittest.cc',
         'gfx/sequential_id_generator_unittest.cc',
@@ -330,6 +333,11 @@
             'gfx/screen_unittest.cc',
           ],
         }],
+        ['use_ozone==1', {
+          'dependencies': [
+          '<(DEPTH)/build/linux/system.gyp:dridrm',
+          ],
+        }],
         ['chromeos==1', {
           'sources!': [
             'base/dragdrop/os_exchange_data_provider_aurax11_unittest.cc',