MacViews: Implement basic NSEvent -> ui::Event conversion for Mac

ui/events/events_stub.cc

Index: ui/events/events_stub.cc
diff --git a/ui/events/events_stub.cc b/ui/events/events_stub.cc
index bece37acbc94fdc815e97117f29f7f3a35adc685..5ab368a8f4962cbc61670f285b129464a81a183f 100644
--- a/ui/events/events_stub.cc
+++ b/ui/events/events_stub.cc
@@ -23,12 +23,10 @@ EventType EventTypeFromNative(const base::NativeEvent& native_event) {
   return ET_UNKNOWN;
 }
 
-#if !defined(OS_MACOSX)
 int EventFlagsFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
-#endif
 
 base::TimeDelta EventTimeFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
@@ -62,6 +60,15 @@ gfx::Vector2d GetMouseWheelOffset(const base::NativeEvent& native_event) {
   return gfx::Vector2d();
 }
 
+base::NativeEvent CopyNativeEvent(const base::NativeEvent& event) {
+  NOTIMPLEMENTED() <<
+      "Don't know how to copy base::NativeEvent for this platform";
+  return NULL;
+}
+
+void ReleaseCopiedNativeEvent(const base::NativeEvent& event) {
+}
+
 void ClearTouchIdIfReleased(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
 }