Fix view policy inheritance on image transforms

Summary:
Inherit viewPolicy from original image in image transforms and warn about Profile transform making transformed images public. Details:

https://hackerone.com/reports/1984060

https://github.com/mozilla-conduit/phabricator/commit/8358b435a99435a95e0dffbbb92f71dc1961bc7b

Closes T15663

Test Plan:
1. Click {nav View Transforms} on an image file with restrictive view policy.
2. See (Image will be Public) warning on Profile transform.
3. Click on Workcard transform.
4. Go back to {nav View Transforms} page and visit the Workcard transformed file.
5. Check if its view policy matches the original file.

Reviewers: O1 Blessed Committers, speck

Reviewed By: O1 Blessed Committers, speck

Subscribers: speck, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15663

Differential Revision: https://we.phorge.it/D25462

Signed-off-by: Zero King <[e-mail]>

src/applications/files/transform/PhabricatorFileImageTransform.php

···
   protected function newFileFromData($data) {
     if ($this->file) {
       $name = $this->file->getName();
+      $inherit_properties = array(
+        'viewPolicy' => $this->file->getViewPolicy(),
+      );
     } else {
       $name = 'default.png';
+      $inherit_properties = array();
     }
 
     $defaults = array(
···
       'name' => $this->getTransformKey().'-'.$name,
     );
 
-    $properties = $this->getFileProperties() + $defaults;
+    $properties = $this->getFileProperties() + $inherit_properties + $defaults;
 
     return PhabricatorFile::newFromFileData($data, $properties);
   }

src/applications/files/transform/PhabricatorFileThumbnailTransform.php

···
   public function generateTransforms() {
     return array(
       id(new PhabricatorFileThumbnailTransform())
-        ->setName(pht("Profile (400px \xC3\x97 400px)"))
+        ->setName(pht("Profile (400px \xC3\x97 400px) (Image will be Public)"))
         ->setKey(self::TRANSFORM_PROFILE)
         ->setDimensions(400, 400)
         ->setScaleUp(true),