Add fetch hook for ANGLE.

Bug: angleproject:7018
Change-Id: I0e685c81a43d247b4f1a0dd93850b30b829ef264
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3461421
Reviewed-by: Josip Sokcevic <sokcevic@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>

fetch.py

@@ -93,7 +93,7 @@ class GclientCheckout(Checkout):
     try:
       gclient_root = self.run_gclient('root', return_stdout=True).strip()
       return (os.path.exists(os.path.join(gclient_root, '.gclient')) or
-              os.path.exists(os.path.join(os.getcwd(), self.root)))
+              os.path.exists(os.path.join(os.getcwd(), self.root, '.git')))
     except subprocess.CalledProcessError:
       pass
     return os.path.exists(os.path.join(os.getcwd(), self.root))

fetch_configs/angle.py

@@ -0,0 +1,48 @@
+# Copyright 2022 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.
+
+import ast
+import sys
+
+import config_util  # pylint: disable=import-error
+
+
+# This class doesn't need an __init__ method, so we disable the warning
+# pylint: disable=no-init
+class ANGLE(config_util.Config):
+  """Basic Config class for ANGLE."""
+
+  @staticmethod
+  def fetch_spec(props):
+    url = 'https://chromium.googlesource.com/angle/angle.git'
+    solution = {
+      'name': '.',
+      'url': url,
+      'deps_file': 'DEPS',
+      'managed': False,
+      'custom_vars': {},
+    }
+    spec = {
+      'solutions': [solution]
+    }
+    if props.get('target_os'):
+      spec['target_os'] = props['target_os'].split(',')
+    if ast.literal_eval(props.get('internal', 'False')):
+      solution['custom_vars']['checkout_angle_internal'] = True
+    return {
+      'type': 'gclient_git',
+      'gclient_git_spec': spec,
+    }
+
+  @staticmethod
+  def expected_root(_props):
+    return ''
+
+
+def main(argv=None):
+  return ANGLE().handle_args(argv)
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))