Move amp-ad CSS to extension

css/amp.css

@@ -408,16 +408,6 @@ amp-pixel {
   visibility: hidden;
 }
 
-/**
- * Force the layout box of the ad iframe to be exactly as big as the actual
- * iframe. The `amp-ad` tag itself can be freely styled.
- */
-amp-ad iframe {
-  border: 0 !important;
-  margin: 0 !important;
-  padding: 0 !important;
-}
-
 /**
  * Instagram wraps the standard image into a fixed size container.
  * With these offsets, users can simply specify the the size of the

extensions/amp-ad/0.1/amp-ad.css

@@ -0,0 +1,25 @@
+/**
+ * Copyright 2016 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.
+ */
+
+/**
+ * Force the layout box of the ad iframe to be exactly as big as the actual
+ * iframe. The `amp-ad` tag itself can be freely styled.
+ */
+amp-ad iframe {
+  border: 0 !important;
+  margin: 0 !important;
+  padding: 0 !important;
+}

extensions/amp-ad/0.1/amp-ad.js

@@ -13,6 +13,7 @@
  * limitations under the License.
  */
 
+import {CSS} from '../../../build/amp-ad-0.1.css';
 import {isLayoutSizeDefined} from '../../../src/layout';
 import {AmpAd3PImpl} from './amp-ad-3p-impl';
 import {a4aRegistry} from '../../../ads/_a4a-config';
@@ -91,5 +92,5 @@ export class AmpAd extends AMP.BaseElement {
   }
 }
 
-AMP.registerElement('amp-ad', AmpAd);
-AMP.registerElement('amp-embed', AmpAd);
+AMP.registerElement('amp-ad', AmpAd, CSS);
+AMP.registerElement('amp-embed', AmpAd, CSS);

gulpfile.js

@@ -48,7 +48,7 @@ var extensions = {};
 declareExtension('amp-access', '0.1', true, 'NO_TYPE_CHECK');
 declareExtension('amp-access-laterpay', '0.1', false, 'NO_TYPE_CHECK');
 declareExtension('amp-accordion', '0.1', true);
-declareExtension('amp-ad', '0.1', false);
+declareExtension('amp-ad', '0.1', true);
 declareExtension('amp-ad-network-adsense-impl', 0.1, false);
 declareExtension('amp-ad-network-doubleclick-impl', 0.1, false);
 declareExtension('amp-ad-network-fake-impl', 0.1, false);