events: Introduce PlatformEventDispatcher and PlatformEventSource.

ui/events/events.gyp

Index: ui/events/events.gyp
diff --git a/ui/events/events.gyp b/ui/events/events.gyp
index 30d2a417488efd6f50edb61314d26db4bc55463c..bddde8db03c0caf8157897bf6457e512df246a98 100644
--- a/ui/events/events.gyp
+++ b/ui/events/events.gyp
@@ -133,6 +133,15 @@
         'ozone/event_factory_ozone.cc',
         'ozone/event_factory_ozone.h',
         'ozone/events_ozone.cc',
+        'platform/platform_event_dispatcher.h',
+        'platform/platform_event_observer.h',
+        'platform/platform_event_source.cc',
+        'platform/platform_event_source.h',
+        'platform/platform_event_types.h',
+        'platform/scoped_event_dispatcher.cc',
+        'platform/scoped_event_dispatcher.h',
+        'platform/x11/x11_event_source.cc',
+        'platform/x11/x11_event_source.h',
         'win/events_win.cc',
         'x/events_x.cc',
       ],
@@ -149,6 +158,11 @@
             '<(DEPTH)/build/linux/system.gyp:x11',
           ],
         }],
+        ['use_glib==1', {
+          'dependencies': [
+            '../../build/linux/system.gyp:glib',
+          ],
+        }],
         ['use_ozone_evdev==1', {
           'defines': ['USE_OZONE_EVDEV=1'],
         }],
@@ -284,6 +298,7 @@
         'latency_info_unittest.cc',
         'ozone/evdev/key_event_converter_evdev_unittest.cc',
         'ozone/evdev/touch_event_converter_evdev_unittest.cc',
+        'platform/platform_event_source_unittest.cc',
         'x/events_x_unittest.cc',
       ],
       'conditions': [