Add fake for InstanceIDWithSubtype.java, in order to re-use unit test

components/gcm_driver/instance_id/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.
 
 # GYP version: components/gcm_driver.gypi:instance_id_driver
 source_set("instance_id") {
   sources = [
     "android/component_jni_registrar.cc",
     "android/component_jni_registrar.h",
     "instance_id.cc",
@@ skipping 23 matching lines @@
     deps += [ "android:jni_headers" ]
   }
 }
 
 # GYP version: components/gcm_driver.gypi:instance_id_test_support
 source_set("test_support") {
   testonly = true
   sources = [
     "fake_gcm_driver_for_instance_id.cc",
     "fake_gcm_driver_for_instance_id.h",
+    "scoped_use_fake_instance_id_android.cc",
+    "scoped_use_fake_instance_id_android.h",
   ]
 
+  public_deps = [
+    ":instance_id",
+  ]
   deps = [
-    ":instance_id",
     "//base",
     "//components/gcm_driver:test_support",
     "//testing/gtest",
   ]
+
+  if (is_android) {
+    deps += [ "android:test_support_jni_headers" ]
+  }
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "instance_id_driver_unittest.cc",
   ]
 
   deps = [
     ":instance_id",
     ":test_support",
     "//base",
     "//google_apis/gcm",
     "//testing/gtest",
   ]
 }