Moterm part 1: Add MotermModel, a "model" for terminal emulation.

mojo/tools/data/apptests

 # This file contains a list of Mojo gtest unit tests.
 #
 # This must be valid Python. It may use the |config| global that will be a
 # mopy.config.Config object, and must set a |tests| global that will contain the
 # list of tests to run.
 #
 # The entries in |tests| are dictionaries of the following form:
 #   {
 #     # Required URL for apptest.
 #     "test": "mojo:test_app_url",
@@ skipping 29 matching lines @@
     "test-args": ["--example_apptest_arg"],
     "shell-args": ["--enable-multiprocess"],
   },
   {
     "test": "mojo:files_apptests",
   },
   {
     "test": "mojo:http_server_apptests",
   },
   {
+    "test": "mojo:moterm_apptests",
+  },
+  {
     "test": "mojo:network_service_apptests",
   },
   {
     "test": "mojo:mojo_view_manager_client_apptests",
     "shell-args": ["--args-for=mojo:native_viewport_service --use-headless-config --use-osmesa"],
   },
   {
     "test": "mojo:view_manager_service_apptests",
     "type": "gtest_isolated",
     "shell-args": ["--args-for=mojo:native_viewport_service --use-headless-config --use-osmesa"],
@@ skipping 55 matching lines @@
       "test": "mojo:dart_apptests",
       "type": "dart",
     },
     {
       # https://github.com/domokit/mojo/issues/61
       # Sometime the shell get a trucated application when exposed through the
       # http server.
       "test": "mojo:shell_apptests",
     },
   ]