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

build/android/pylib/utils/watchdog_timer.py

+# Copyright 2013 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.
+
+"""WatchdogTimer timeout objects."""
+
+import time
+
+
+class WatchdogTimer(object):
+  """A resetable timeout-based watchdog.
+
+  This object is threadsafe.
+  """
+
+  def __init__(self, timeout):
+    """Initializes the watchdog.
+
+    Args:
+      timeout: The timeout in seconds. If timeout is None it will never timeout.
+    """
+    self._start_time = time.time()
+    self._timeout = timeout
+
+  def Reset(self):
+    """Resets the timeout countdown."""
+    self._start_time = time.time()
+
+  def GetElapsed(self):
+    """Returns the elapsed time of the watchdog."""
+    return time.time() - self._start_time
+
+  def GetRemaining(self):
+    """Returns the remaining time of the watchdog."""
+    if self._timeout:
+      return self._timeout - self.GetElapsed()
+    else:
+      return None
+
+  def IsTimedOut(self):
+    """Whether the watchdog has timed out.
+
+    Returns:
+      True if the watchdog has timed out, False otherwise.
+    """
+    remaining = self.GetRemaining()
+    return remaining is not None and remaining < 0