[Mac/GN] Set up the component build.

ui/events/BUILD.gn

Index: ui/events/BUILD.gn
diff --git a/ui/events/BUILD.gn b/ui/events/BUILD.gn
index 7b891e0f7f0d0cfd9dead107eede90fbdd0e4c43..79a69cdeb70597e2e2b729b34bd55a8f4752f029 100644
--- a/ui/events/BUILD.gn
+++ b/ui/events/BUILD.gn
@@ -82,6 +82,13 @@ component("events_base") {
   if (!is_ios) {
     deps += [ "//ipc:param_traits" ]
   }
+
+  if (is_mac) {
+    libs = [
+      "AppKit.framework",
+      "Carbon.framework",
+    ]
+  }
 }
 
 component("events") {
@@ -201,6 +208,10 @@ component("events") {
       ":motionevent_jni_headers",
     ]
   }
+
+  if (is_mac) {
+    libs = [ "AppKit.framework" ]
+  }
 }
 
 component("gesture_detection") {