Add a snapshot of flutter/engine/src/build to our sdk

build/android/pylib/device/device_blacklist.py

+# Copyright 2014 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 json
+import os
+import threading
+
+from pylib import constants
+_BLACKLIST_JSON = os.path.join(
+    constants.DIR_SOURCE_ROOT,
+    os.environ.get('CHROMIUM_OUT_DIR', 'out'),
+    'bad_devices.json')
+
+# Note that this only protects against concurrent accesses to the blacklist
+# within a process.
+_blacklist_lock = threading.RLock()
+
+def ReadBlacklist():
+  """Reads the blacklist from the _BLACKLIST_JSON file.
+
+  Returns:
+    A list containing bad devices.
+  """
+  with _blacklist_lock:
+    if not os.path.exists(_BLACKLIST_JSON):
+      return []
+
+    with open(_BLACKLIST_JSON, 'r') as f:
+      return json.load(f)
+
+
+def WriteBlacklist(blacklist):
+  """Writes the provided blacklist to the _BLACKLIST_JSON file.
+
+  Args:
+    blacklist: list of bad devices to write to the _BLACKLIST_JSON file.
+  """
+  with _blacklist_lock:
+    with open(_BLACKLIST_JSON, 'w') as f:
+      json.dump(list(set(blacklist)), f)
+
+
+def ExtendBlacklist(devices):
+  """Adds devices to _BLACKLIST_JSON file.
+
+  Args:
+    devices: list of bad devices to be added to the _BLACKLIST_JSON file.
+  """
+  with _blacklist_lock:
+    blacklist = ReadBlacklist()
+    blacklist.extend(devices)
+    WriteBlacklist(blacklist)
+
+
+def ResetBlacklist():
+  """Erases the _BLACKLIST_JSON file if it exists."""
+  with _blacklist_lock:
+    if os.path.exists(_BLACKLIST_JSON):
+      os.remove(_BLACKLIST_JSON)
+