Split the event library into a cross-platform and native part. Part 1.

mojo/tools/data/unittests

 # This file contains a list of Mojo gtest unit tests.
 # This must be a valid python dictionary.
 # TODO(vtl): Add a way of specifying data dependencies instead of cacheable.
 [
   # System tests:
   {
     "test": "mojo_system_unittests",
     "run_on_android": True,
   },
 
@@ skipping 34 matching lines @@
     "test": "view_manager_service_unittests",
   },
   {
     "test": "window_manager_unittests",
   },
 
   # Tests for components we depend on:
   {
     "test": "gfx_unittests",
   },
+  {
+    "test": "events_unittests",
+  },
 
   # JavaScript tests:
   {
     "test": "js_unittests",
     "cacheable": False,
   },
   {
     "test": "js_integration_tests",
     "cacheable": False,
   },
   {
     "test": "js_services_unittests",
     "cacheable": False,
   },
 
   # Shell integration tests:
   {
     "test": "mojo_shell_tests",
     "cacheable": False,
     "run_on_android": True,
   },
 ]