Issue #2720803 by Eric_A: Missing composer.json file in \Drupal\Component\FileSystem

(cherry picked from commit 6347dec5)

core/composer.json

@@ -70,6 +70,7 @@
         "drupal/core-discovery": "self.version",
         "drupal/core-event-dispatcher": "self.version",
         "drupal/core-file-cache": "self.version",
+        "drupal/core-filesystem": "self.version",
         "drupal/core-gettext": "self.version",
         "drupal/core-graph": "self.version",
         "drupal/core-php-storage": "self.version",

core/lib/Drupal/Component/FileSystem/LICENSE.txt

+        GNU GENERAL PUBLIC LICENSE
+           Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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+
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+  Ty Coon, President of Vice
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+Public License instead of this License.

core/lib/Drupal/Component/FileSystem/README.txt

+The Drupal FileSystem Component
+
+Thanks for using this Drupal component.
+
+You can participate in its development on Drupal.org, through our issue system:
+https://www.drupal.org/project/issues/drupal
+
+You can get the full Drupal repo here:
+https://www.drupal.org/project/drupal/git-instructions
+
+You can browse the full Drupal repo here:
+http://cgit.drupalcode.org/drupal

core/lib/Drupal/Component/FileSystem/TESTING.txt

+HOW-TO: Test this Drupal component
+
+In order to test this component, you'll need to get the entire Drupal repo and
+run the tests there.
+
+You'll find the tests under core/tests/Drupal/Tests/Component.
+
+You can get the full Drupal repo here:
+https://www.drupal.org/project/drupal/git-instructions
+
+You can find more information about running PHPUnit tests with Drupal here:
+https://www.drupal.org/node/2116263
+
+Each component in the Drupal\Component namespace has its own annotated test
+group. You can use this group to run only the tests for this component. Like
+this:
+
+$ ./vendor/bin/phpunit -c core --group FileSystem

core/lib/Drupal/Component/FileSystem/composer.json

+{
+  "name": "drupal/core-filesystem",
+  "description": "FileSystem.",
+  "keywords": ["drupal"],
+  "homepage": "https://www.drupal.org/project/drupal",
+  "license": "GPL-2.0+",
+  "require": {
+    "php": ">=5.5.9"
+  },
+  "autoload": {
+    "psr-4": {
+      "Drupal\\Component\\FileSystem\\": ""
+    }
+  }
+}

core/tests/Drupal/Tests/ComposerIntegrationTest.php

@@ -52,6 +52,7 @@ protected function getPaths() {
       $this->root . '/core/lib/Drupal/Component/Discovery',
       $this->root . '/core/lib/Drupal/Component/EventDispatcher',
       $this->root . '/core/lib/Drupal/Component/FileCache',
+      $this->root . '/core/lib/Drupal/Component/FileSystem',
       $this->root . '/core/lib/Drupal/Component/Gettext',
       $this->root . '/core/lib/Drupal/Component/Graph',
       $this->root . '/core/lib/Drupal/Component/HttpFoundation',