android_emulator.md: Update to mention -read-only flag. Remove virtualgl

-read-only is an awesome new feature!

I haven't found virtualgl to be necessary any more.

Bug: 965498
Change-Id: Ief49d15d4cf8f8c0d3d8a968d0ffdf3703a74a46
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621628
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#662329}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: c8f2703db09860ffb8e570259ac56193f1cd7a0d
diff --git a/emulator/OWNERS b/emulator/OWNERS
deleted file mode 100644
index a0e0826..0000000
--- a/emulator/OWNERS
+++ /dev/null
@@ -1,2 +0,0 @@
-agrieve@chromium.org
-wnwen@chromium.org
diff --git a/emulator/clone_avd.py b/emulator/clone_avd.py
deleted file mode 100755
index 8e182ee..0000000
--- a/emulator/clone_avd.py
+++ /dev/null
@@ -1,76 +0,0 @@
-#!/usr/bin/env python
-# Copyright 2018 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-"""Clones an Android Emulator image.
-
-Create an emulator image via Android Studio and then use this script to clone
-it. Cloning an image enables you to run multiple emulators at the same time, and
-thus run tests faster.
-"""
-import argparse
-import os
-import re
-import shutil
-
-
-def main():
-  parser = argparse.ArgumentParser(description=__doc__)
-  parser.add_argument('--source-ini', required=True,
-                      help='Path to ~/.android/avd/source.ini to clone')
-  parser.add_argument('--dest-ini', required=True,
-                      help='Path to ~/.android/avd/dest.ini to create')
-  parser.add_argument('--display-name', required=True,
-                      help='Name for emulator window & Android Studio list')
-
-  args = parser.parse_args()
-
-  avd_dir = os.path.dirname(args.source_ini)
-
-  old_ini_path = args.source_ini
-  old_avd_id = os.path.basename(old_ini_path)[:-4]
-  old_avd_path = os.path.join(avd_dir, old_avd_id + '.avd')
-
-  new_ini_path = args.dest_ini
-  new_avd_id = os.path.basename(new_ini_path)[:-4]
-  new_avd_path = os.path.join(avd_dir, new_avd_id + '.avd')
-
-  if not re.match(r'\w+$', new_avd_id):
-    parser.error('--dest-ini should be alphanumeric.')
-  if not os.path.exists(old_ini_path):
-    parser.error('Path does not exist: ' + old_ini_path)
-  if not os.path.exists(old_avd_path):
-    parser.error('Path does not exist: ' + old_avd_path)
-  if os.path.exists(new_ini_path):
-    parser.error('Destination path already exists: ' + new_ini_path)
-  if os.path.exists(new_avd_path):
-    parser.error('Destination path already exists: ' + new_avd_path)
-
-  shutil.copy(old_ini_path, new_ini_path)
-  with open(new_ini_path, 'r+') as f:
-    data = f.read()
-    data = data.replace(old_avd_id + '.avd', new_avd_id + '.avd')
-    f.truncate(0)
-    f.write(data)
-
-  print 'Copying avd...'
-  shutil.copytree(old_avd_path, new_avd_path,
-                  ignore=shutil.ignore_patterns('*.lock'))
-
-  with open(os.path.join(new_avd_path, 'config.ini'), 'r+') as f:
-    data = f.read()
-    # AvdId=Android_O_26_x86
-    # avd.ini.displayname=Android O (26) x86
-    data = re.sub(r'AvdId=.+', 'AvdId=' + new_avd_id, data)
-    data = re.sub(r'avd.ini.displayname=.+',
-                  'avd.ini.displayname=' + args.display_name,
-                  data)
-    f.truncate(0)
-    f.write(data)
-
-  print 'Done!'
-
-
-if __name__ == '__main__':
-  main()