Restructure the events target into two components:

ui/events/events.gyp

Index: ui/events/events.gyp
diff --git a/ui/events/events.gyp b/ui/events/events.gyp
index eb11794f97821e56e2a802eed36fe5dd5c86d055..6770cf600ccfeb6be7136571208705ce85c601fa 100644
--- a/ui/events/events.gyp
+++ b/ui/events/events.gyp
@@ -8,19 +8,47 @@
   },
   'targets': [
     {
+      'target_name': 'events_base',
+      'type': '<(component)',
+      'dependencies': [
+        '<(DEPTH)/base/base.gyp:base',
+        ],
+      'defines': [
+        'EVENTS_BASE_IMPLEMENTATION',
+      ],
+      'sources': [
+        'events_base_export.h',
+        'event_switches.cc',
+        'event_switches.h',
+        'keycodes/keyboard_code_conversion.cc',
+        'keycodes/keyboard_code_conversion.h',
+        'keycodes/keyboard_code_conversion_android.cc',
+        'keycodes/keyboard_code_conversion_android.h',
+        'keycodes/keyboard_code_conversion_gtk.cc',
+        'keycodes/keyboard_code_conversion_gtk.h',
+        'keycodes/keyboard_code_conversion_mac.h',
+        'keycodes/keyboard_code_conversion_mac.mm',
+        'keycodes/keyboard_code_conversion_win.cc',
+        'keycodes/keyboard_code_conversion_win.h',
+        'keycodes/keyboard_code_conversion_x.cc',
+        'keycodes/keyboard_code_conversion_x.h',
+        'keycodes/keyboard_codes.h',
+        'latency_info.cc',
+        'latency_info.h',
+      ],
+    },
+    {
       'target_name': 'events',
       'type': '<(component)',
       'dependencies': [
         '<(DEPTH)/base/base.gyp:base',
-        '<(DEPTH)/base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
-        '<(DEPTH)/skia/skia.gyp:skia',
         '../gfx/gfx.gyp:gfx',
+        'events_base',
       ],
       'defines': [
         'EVENTS_IMPLEMENTATION',
       ],
       'sources': [
-        'cocoa/events_mac.mm',
         'event.cc',
         'event.h',
         'event_constants.h',
@@ -28,13 +56,12 @@
         'event_dispatcher.h',
         'event_handler.cc',
         'event_handler.h',
-        'event_switches.cc',
-        'event_switches.h',
         'event_target.cc',
         'event_target.h',
         'event_utils.cc',
         'event_utils.h',
         'events_export.h',
+        'events_stub.cc',
         'gestures/gesture_configuration.cc',
         'gestures/gesture_configuration.h',
         'gestures/gesture_point.cc',
@@ -50,21 +77,6 @@
         'gestures/gesture_util.h',
         'gestures/velocity_calculator.cc',
         'gestures/velocity_calculator.h',
-        'keycodes/keyboard_code_conversion.cc',
-        'keycodes/keyboard_code_conversion.h',
-        'keycodes/keyboard_code_conversion_android.cc',
-        'keycodes/keyboard_code_conversion_android.h',
-        'keycodes/keyboard_code_conversion_gtk.cc',
-        'keycodes/keyboard_code_conversion_gtk.h',
-        'keycodes/keyboard_code_conversion_mac.h',
-        'keycodes/keyboard_code_conversion_mac.mm',
-        'keycodes/keyboard_code_conversion_win.cc',
-        'keycodes/keyboard_code_conversion_win.h',
-        'keycodes/keyboard_code_conversion_x.cc',
-        'keycodes/keyboard_code_conversion_x.h',
-        'keycodes/keyboard_codes.h',
-        'latency_info.cc',
-        'latency_info.h',
         'ozone/evdev/event_factory.cc',
         'ozone/evdev/event_factory.h',
         'ozone/evdev/event_modifiers.cc',
@@ -90,25 +102,11 @@
         'x/touch_factory_x11.h',
       ],
       'conditions': [
-        ['use_aura==0 and toolkit_views==0', {
-          'sources/': [
-            ['exclude', '^gestures/*'],
-          ],
-          'sources!': [
-            'event.cc',
-            'event.h',
-            'event_dispatcher.cc',
-            'event_dispatcher.h',
-            'event_handler.cc',
-            'event_handler.h',
-            'event_target.cc',
-            'event_target.h',
-          ],
-        }],
-        ['OS=="android"', {
+        # We explicitly enumerate the platforms we _do_ provide native cracking
+        # for here.
+        ['OS=="win" or use_x11==1 or use_ozone==1', {
           'sources!': [
-            'event_utils.cc',
-            'keycodes/keyboard_code_conversion.cc',
+            'events_stub.cc',
           ],
         }],
         ['use_x11==1', {