Add basic test suite for Blimp

blimp/BUILD.gn

 # Copyright 2015 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.
 
 group("blimp") {
   deps = [
     "//blimp/client:blimp_client",
     "//blimp/common:blimp_common",
   ]
 
   if (is_android) {
     deps += [ "//blimp/client:blimp_apk" ]
   }
 }
+
+group("blimp_tests") {
+  testonly = true
+
+  deps = [
+    ":blimp",
+  ]
+
+  if (is_android) {
+    deps += [ "//blimp/client:blimp_test_apk" ]
+  }
+}