On login forms, autofocus the "username" field

Summary: Depends on D20120. Fixes T8907. I thought this needed some Javascript nonsense but Safari, Firefox and Chrome all support an `autofocus` attribute.

Test Plan: Loaded login page with password auth enabled in Safari, Firefox, and Chrome; saw username field automatically gain focus.

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T8907

Differential Revision: https://secure.phabricator.com/D20122

src/applications/auth/provider/PhabricatorLDAPAuthProvider.php

@@ -112,6 +112,7 @@ final class PhabricatorLDAPAuthProvider extends PhabricatorAuthProvider {
         id(new AphrontFormTextControl())
           ->setLabel(pht('LDAP Username'))
           ->setName('ldap_username')
+          ->setAutofocus(true)
           ->setValue($v_user)
           ->setError($e_user))
       ->appendChild(

src/applications/auth/provider/PhabricatorPasswordAuthProvider.php

@@ -229,6 +229,7 @@ final class PhabricatorPasswordAuthProvider extends PhabricatorAuthProvider {
         id(new AphrontFormTextControl())
           ->setLabel(pht('Username or Email'))
           ->setName('username')
+          ->setAutofocus(true)
           ->setValue($v_user)
           ->setError($e_user))
       ->appendChild(

src/view/form/control/AphrontFormTextControl.php

@@ -5,6 +5,7 @@ final class AphrontFormTextControl extends AphrontFormControl {
   private $disableAutocomplete;
   private $sigil;
   private $placeholder;
+  private $autofocus;
 
   public function setDisableAutocomplete($disable) {
     $this->disableAutocomplete = $disable;
@@ -24,6 +25,15 @@ final class AphrontFormTextControl extends AphrontFormControl {
     return $this;
   }
 
+  public function setAutofocus($autofocus) {
+    $this->autofocus = $autofocus;
+    return $this;
+  }
+
+  public function getAutofocus() {
+    return $this->autofocus;
+  }
+
   public function getSigil() {
     return $this->sigil;
   }
@@ -49,6 +59,7 @@ final class AphrontFormTextControl extends AphrontFormControl {
         'id'           => $this->getID(),
         'sigil'        => $this->getSigil(),
         'placeholder'  => $this->getPlaceholder(),
+        'autofocus' => ($this->getAutofocus() ? 'autofocus' : null),
       ));
   }