Import SwG button stylesheet

extensions/amp-subscriptions-google/0.1/amp-subscriptions-google.css

@@ -0,0 +1,17 @@
+/**
+ * Copyright 2015 The AMP HTML Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS-IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+@import url("../../../third_party/subscriptions-project/swg-button.css");

extensions/amp-subscriptions-google/0.1/amp-subscriptions-google.js

@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+import {CSS} from '../../../build/amp-subscriptions-google-0.1.css';
 import {
   ConfiguredRuntime,
   Fetcher,
@@ -23,6 +24,7 @@ import {DocImpl} from '../../amp-subscriptions/0.1/doc-impl';
 import {Entitlement} from '../../amp-subscriptions/0.1/entitlement';
 import {PageConfig} from '../../../third_party/subscriptions-project/config';
 import {Services} from '../../../src/services';
+import {installStylesForDoc} from '../../../src/style-installer';
 import {parseUrlDeprecated} from '../../../src/url';
 
 const TAG = 'amp-subscriptions-google';
@@ -98,6 +100,9 @@ export class GoogleSubscriptionsPlatform {
     /** @private {boolean} */
     this.isGoogleViewer_ = false;
     this.resolveGoogleViewer_(Services.viewerForDoc(ampdoc));
+
+    // Install styles.
+    installStylesForDoc(ampdoc, CSS, () => {}, false, TAG);
   }
 
   /**

gulpfile.js

@@ -176,7 +176,7 @@ declareExtension('amp-position-observer', '0.1');
 declareExtension('amp-date-picker', '0.1', {hasCss: true});
 declareExtension('amp-image-viewer', '0.1', {hasCss: true});
 declareExtension('amp-subscriptions', '0.1', {hasCss: true});
-declareExtension('amp-subscriptions-google', '0.1');
+declareExtension('amp-subscriptions-google', '0.1', {hasCss: true});
 /**
  * @deprecated `amp-slides` is deprecated and will be deleted before 1.0.
  * Please see {@link AmpCarousel} with `type=slides` attribute instead.