Add a contextual "scope" dropdown for searches

Summary: Add a "Search for ... in (document group)" thing that picks the current
scope based on the current application.

Test Plan: Conducted searches in several browsers.

Reviewers: btrahan, skrul

Reviewed By: btrahan

CC: aran, epriestley

Maniphest Tasks: T858

Differential Revision: https://secure.phabricator.com/D1610

src/applications/differential/controller/base/DifferentialController.php

@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright 2011 Facebook, Inc.
+ * Copyright 2012 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -35,6 +35,7 @@ abstract class DifferentialController extends PhabricatorController {
     $page->setGlyph("\xE2\x9A\x99");
     $page->appendChild($view);
     $page->setIsLoggedOut($viewer_is_anonymous);
+    $page->setSearchDefaultScope(PhabricatorSearchScope::SCOPE_OPEN_REVISIONS);
 
     $response = new AphrontWebpageResponse();
     return $response->setContent($page->render());

src/applications/differential/controller/base/__init__.php

@@ -8,6 +8,7 @@
 
 phutil_require_module('phabricator', 'aphront/response/webpage');
 phutil_require_module('phabricator', 'applications/base/controller/base');
+phutil_require_module('phabricator', 'applications/search/constants/scope');
 phutil_require_module('phabricator', 'infrastructure/celerity/api');
 phutil_require_module('phabricator', 'infrastructure/env');