wayland: define base:NativeEvent for Wayland

ui/base/wayland/events_wayland.cc

Index: ui/base/wayland/events_wayland.cc
diff --git a/ui/base/wayland/events_wayland.cc b/ui/base/wayland/events_wayland.cc
index df6ffacc048a0972f40f54cf10ff46ca0fcd8d5c..a52a93b4c5693e7c58487d6bda6860e1e4d312fa 100644
--- a/ui/base/wayland/events_wayland.cc
+++ b/ui/base/wayland/events_wayland.cc
@@ -4,13 +4,31 @@
 
 #include "ui/base/events.h"
 
+#include <linux/input.h>
 #include <X11/extensions/XInput2.h>
 
+#include "base/event_types.h"
 #include "base/logging.h"
 #include "ui/base/keycodes/keyboard_code_conversion_x.h"
-#include "ui/wayland/events/wayland_event.h"
 #include "ui/gfx/point.h"
 
+using namespace base::wayland;
+
+namespace ui {
+
+// These are the mouse events expected. The event type Wayland sends is an
+// evdev event. The following is the correct mapping from evdev to expected
+// events type.
+enum WaylandEventButtonType {
+  LEFT_BUTTON     = BTN_LEFT,
+  MIDDLE_BUTTON   = BTN_RIGHT,
+  RIGHT_BUTTON    = BTN_MIDDLE,
+  SCROLL_UP       = BTN_SIDE,
+  SCROLL_DOWN     = BTN_EXTRA,
+};
+
+} // namespace ui
+
 namespace {
 
 // Scroll amount for each wheelscroll event. 53 is also the value used for GTK+.
@@ -126,7 +144,7 @@ bool IsMouseEvent(const base::NativeEvent& native_event) {
 }
 
 int GetMouseWheelOffset(const base::NativeEvent& native_event) {
-  return native_event->button.button == ui::SCROLL_UP ?
+  return native_event->button.button == SCROLL_UP ?
       kWheelScrollAmount : -kWheelScrollAmount;
 }