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

ui/events/events.gyp

Index: ui/events/events.gyp
diff --git a/ui/events/events.gyp b/ui/events/events.gyp
index 1aabbe30a2e8270bf40fafb524170d2321378808..cb796e55a59a8f9314d32efd9932765b3b1a799d 100644
--- a/ui/events/events.gyp
+++ b/ui/events/events.gyp
@@ -85,6 +85,7 @@
       'sources': [
         'cocoa/cocoa_event_utils.h',
         'cocoa/cocoa_event_utils.mm',
+        'cocoa/events_mac.mm',
         'event.cc',
         'event.h',
         'event_dispatcher.cc',
@@ -166,7 +167,7 @@
       'conditions': [
         # We explicitly enumerate the platforms we _do_ provide native cracking
         # for here.
-        ['OS=="win" or use_x11==1 or use_ozone==1', {
+        ['OS=="win" or OS=="mac" or use_x11==1 or use_ozone==1', {
           'sources!': [
             'events_stub.cc',
           ],
@@ -337,7 +338,7 @@
         'gesture_detection'
       ],
       'sources': [
-        'cocoa/cocoa_event_utils_unittest.mm',
+        'cocoa/events_mac_unittest.mm',
         'event_dispatcher_unittest.cc',
         'event_processor_unittest.cc',
         'event_rewriter_unittest.cc',