Add a simple prototype "terminal" example.

examples/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
 
 group("examples") {
   testonly = true
 
   deps = [
     "//examples/apptest",
     "//examples/browser",
     "//examples/content_handler_demo",
     "//examples/dart/console_example",
     "//examples/dart/hello_world/hello",
     "//examples/dart/hello_world/world",
     "//examples/dart/wget",
     "//examples/echo",
+    "//examples/echo_terminal",
     "//examples/embedded_app",
     "//examples/forwarding_content_handler",
     "//examples/ganesh_app",
     "//examples/http_handler",
     "//examples/indirect_service",
     "//examples/nesting_app",
     "//examples/png_viewer",
     "//examples/recipes",
     "//examples/recursive_content_handler",
     "//examples/sky_compositor_app",
@@ skipping 13 matching lines @@
     deps += [
       "//examples/android",
       "//examples/device_name",
     ]
   }
 
   if (is_linux) {
     deps += [ "//examples/python" ]
   }
 }