Create Tether Chrome OS component and add a skeleton Initializer class.

chromeos/components/BUILD.gn

Index: chromeos/components/BUILD.gn
diff --git a/chromeos/components/BUILD.gn b/chromeos/components/BUILD.gn
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+++ b/chromeos/components/BUILD.gn
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+# Copyright 2016 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("//testing/test.gni")
+
+assert(is_chromeos, "Non-ChromeOS builds cannot depend on //chromeos")
+
+# To add a unit test to this target, make a "unit_test" source_set in your
+# component and add a reference here.
+test("chromeos_components_unittests") {
+  sources = [
+    "run_all_unittests.cc",
+  ]
+
+  deps = [
+    "//base",
+    "//base/test:test_support",
+    "//chromeos/components/tether:unit_tests",
+  ]
+}