Adding Wayland support for ui/gfx

ui/ui.gyp

Index: ui/ui.gyp
diff --git a/ui/ui.gyp b/ui/ui.gyp
index 9306181976c1708dcd70324aa1b931e5ef5750f9..b53635e93327d9773d5673a79bb2e4de88d0d28c 100644
--- a/ui/ui.gyp
+++ b/ui/ui.gyp
@@ -257,6 +257,7 @@
         'gfx/render_text_win.h',
         'gfx/screen.h',
         'gfx/screen_gtk.cc',
+        'gfx/screen_wayland.cc',
         'gfx/screen_win.cc',
         'gfx/scoped_cg_context_save_gstate_mac.h',
         'gfx/scoped_ns_graphics_context_save_gstate_mac.h',
@@ -320,6 +321,25 @@
             }],
           ],
         }],
+        ['use_wayland == 1', {
+          'sources/': [
+            ['exclude', '_(gtk|x)\\.cc$'],
+            ['exclude', '/(gtk|x11)_[^/]*\\.cc$'],
+            ['include', 'base/dragdrop/gtk_dnd_util.cc'],
+            ['include', 'base/dragdrop/gtk_dnd_util.h'],
+            ['include', 'base/dragdrop/os_exchange_data_provider_gtk.cc'],
+            ['include', 'base/dragdrop/os_exchange_data_provider_gtk.h'],
+            ['include', 'base/keycodes/keyboard_code_conversion_x.cc'],
+            ['include', 'base/keycodes/keyboard_code_conversion_x.h'],
+            ['include', 'base/view_prop.cc'],
+            ['include', 'base/view_prop.h'],
+            ['include', 'gfx/gtk_util.cc'],
+            ['include', 'gfx/gtk_util.h'],
+            ['include', 'gfx/path_gtk.cc'],
+            ['include', 'gfx/platform_font_gtk.cc'],
+            ['include', 'gfx/platform_font_gtk.h'],
+          ],
+        }],
         ['OS=="win"', {
           'sources': [
             'gfx/canvas_direct2d.cc',