Add fetch configs for dawn, libyuv and openscreen

I used the crossbench config as a basis.

Bug: None
Change-Id: I7efa2f8fae4aaf723623307934ee0cf2928a3dd3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/7019389
Auto-Submit: Victor Vianna <victorvianna@google.com>
Reviewed-by: Gavin Mak <gavinmak@google.com>
Commit-Queue: Gavin Mak <gavinmak@google.com>

fetch_configs/dawn.py

@@ -0,0 +1,43 @@
+# Copyright 2025 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 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 Dawn(config_util.Config):
+    """Basic Config class for Dawn."""
+
+    @staticmethod
+    def fetch_spec(props):
+        url = 'https://dawn.googlesource.com/dawn.git'
+        solution = {
+            'name': 'dawn',
+            'url': url,
+            'deps_file': 'DEPS',
+            'managed': False,
+            'custom_deps': {},
+        }
+        spec = {
+            'solutions': [solution],
+        }
+        return {
+            'type': 'gclient_git',
+            'gclient_git_spec': spec,
+        }
+
+    @staticmethod
+    def expected_root(_props):
+        return 'dawn'
+
+
+def main(argv=None):
+    return Dawn().handle_args(argv)
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))

fetch_configs/libyuv.py

@@ -0,0 +1,43 @@
+# Copyright 2025 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 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 Libyuv(config_util.Config):
+    """Basic Config class for libyuv."""
+
+    @staticmethod
+    def fetch_spec(props):
+        url = 'https://chromium.googlesource.com/libyuv/libyuv.git'
+        solution = {
+            'name': 'libyuv',
+            'url': url,
+            'deps_file': 'DEPS',
+            'managed': False,
+            'custom_deps': {},
+        }
+        spec = {
+            'solutions': [solution],
+        }
+        return {
+            'type': 'gclient_git',
+            'gclient_git_spec': spec,
+        }
+
+    @staticmethod
+    def expected_root(_props):
+        return 'libyuv'
+
+
+def main(argv=None):
+    return Libyuv().handle_args(argv)
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))

fetch_configs/openscreen.py

@@ -0,0 +1,43 @@
+# Copyright 2025 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 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 Openscreen(config_util.Config):
+    """Basic Config class for openscreen."""
+
+    @staticmethod
+    def fetch_spec(props):
+        url = 'https://chromium.googlesource.com/openscreen.git'
+        solution = {
+            'name': 'openscreen',
+            'url': url,
+            'deps_file': 'DEPS',
+            'managed': False,
+            'custom_deps': {},
+        }
+        spec = {
+            'solutions': [solution],
+        }
+        return {
+            'type': 'gclient_git',
+            'gclient_git_spec': spec,
+        }
+
+    @staticmethod
+    def expected_root(_props):
+        return 'openscreen'
+
+
+def main(argv=None):
+    return Openscreen().handle_args(argv)
+
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))