Extend "fulltext" and "ngrams" interfaces from "indexable" interface

Summary: Ref T8788. See D17702. This allows `bin/search index` to index stuff which only implements `Ngrams`, not `Fulltext`.

Test Plan: Kinda poked around `bin/search index` a bit, yell if you hit more issues deeper down the stack?

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T8788

Differential Revision: https://secure.phabricator.com/D17704

src/__phutil_library_map__.php

@@ -2924,6 +2924,7 @@ phutil_register_library_map(array(
     'PhabricatorIndexEngine' => 'applications/search/index/PhabricatorIndexEngine.php',
     'PhabricatorIndexEngineExtension' => 'applications/search/index/PhabricatorIndexEngineExtension.php',
     'PhabricatorIndexEngineExtensionModule' => 'applications/search/index/PhabricatorIndexEngineExtensionModule.php',
+    'PhabricatorIndexableInterface' => 'applications/search/interface/PhabricatorIndexableInterface.php',
     'PhabricatorInfrastructureTestCase' => '__tests__/PhabricatorInfrastructureTestCase.php',
     'PhabricatorInlineCommentController' => 'infrastructure/diff/PhabricatorInlineCommentController.php',
     'PhabricatorInlineCommentInterface' => 'infrastructure/diff/interface/PhabricatorInlineCommentInterface.php',
@@ -8025,6 +8026,7 @@ phutil_register_library_map(array(
     'PhabricatorFulltextEngineExtension' => 'Phobject',
     'PhabricatorFulltextEngineExtensionModule' => 'PhabricatorConfigModule',
     'PhabricatorFulltextIndexEngineExtension' => 'PhabricatorIndexEngineExtension',
+    'PhabricatorFulltextInterface' => 'PhabricatorIndexableInterface',
     'PhabricatorFulltextResultSet' => 'Phobject',
     'PhabricatorFulltextStorageEngine' => 'Phobject',
     'PhabricatorFulltextToken' => 'Phobject',
@@ -8299,6 +8301,7 @@ phutil_register_library_map(array(
     'PhabricatorNavigationRemarkupRule' => 'PhutilRemarkupRule',
     'PhabricatorNeverTriggerClock' => 'PhabricatorTriggerClock',
     'PhabricatorNgramsIndexEngineExtension' => 'PhabricatorIndexEngineExtension',
+    'PhabricatorNgramsInterface' => 'PhabricatorIndexableInterface',
     'PhabricatorNotificationBuilder' => 'Phobject',
     'PhabricatorNotificationClearController' => 'PhabricatorNotificationController',
     'PhabricatorNotificationClient' => 'Phobject',

src/applications/search/interface/PhabricatorFulltextInterface.php

@@ -1,6 +1,7 @@
 <?php
 
-interface PhabricatorFulltextInterface {
+interface PhabricatorFulltextInterface
+  extends PhabricatorIndexableInterface {
 
   public function newFulltextEngine();
 

src/applications/search/interface/PhabricatorIndexableInterface.php

@@ -0,0 +1,3 @@
+<?php
+
+interface PhabricatorIndexableInterface {}

src/applications/search/interface/PhabricatorNgramsInterface.php

@@ -1,6 +1,7 @@
 <?php
 
-interface PhabricatorNgramsInterface {
+interface PhabricatorNgramsInterface
+  extends PhabricatorIndexableInterface {
 
   public function newNgrams();
 

src/applications/search/management/PhabricatorSearchManagementIndexWorkflow.php

@@ -213,7 +213,7 @@ final class PhabricatorSearchManagementIndexWorkflow
 
   private function loadPHIDsByTypes($type) {
     $objects = id(new PhutilClassMapQuery())
-      ->setAncestorClass('PhabricatorFulltextInterface')
+      ->setAncestorClass('PhabricatorIndexableInterface')
       ->execute();
 
     $normalized_type = phutil_utf8_strtolower($type);