Add groundwork for marking site pressable

client/state/sites/reducer.js

@@ -75,6 +75,15 @@ export function items( state = {}, action ) {
 			}
 			return state;
 
+		case 'PRESSABLE_ACTIVATE':
+			const originalSite = state[ action.siteId ];
+			if ( originalSite ) {
+				return Object.assign( {}, state, {
+					[ action.siteId ]: merge( {}, originalSite, { options: { pressable: true } } )
+				} );
+			}
+			return state;
+
 		case SITE_RECEIVE: {
 			const site = pick( action.site, VALID_SITE_KEYS );
 			return Object.assign( {}, state, {

client/state/sites/selectors.js

@@ -133,6 +133,23 @@ export function isJetpackSite( state, siteId ) {
 	return site.jetpack;
 }
 
+/**
+ * Returns true if site is a Pressable Jetpack site, false if the site is hosted on
+ * WordPress.com or is a regular Jetpack, or null if the site is unknown.
+ *
+ * @param  {Object}   state  Global state tree
+ * @param  {Number}   siteId Site ID
+ * @return {?Boolean}        Whether site is a Pressable site
+ */
+export function isPressableSite( state, siteId ) {
+	const site = getRawSite( state, siteId );
+	if ( ! site ) {
+		return null;
+	}
+
+	return site.options.pressable;
+}
+
 /**
  * Returns true if the site is a Jetpack site with the specified module active,
  * or false if the module is not active. Returns null if the site is not known