[Android] Provide a logging suppressing context manager

build/android/pylib/utils/logging_utils.py

Index: build/android/pylib/utils/logging_utils.py
diff --git a/build/android/pylib/utils/logging_utils.py b/build/android/pylib/utils/logging_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..1e46fa82080629d5b9acc5e97601835d1dd476fd
--- /dev/null
+++ b/build/android/pylib/utils/logging_utils.py
@@ -0,0 +1,27 @@
+# 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 contextlib
+import logging
+
+@contextlib.contextmanager
+def SuppressLogging(level=logging.ERROR):

[jbudorick, 2015/01/26 16:07:32]

My only comment on this is that handling levels as "x and below" feels ...
weird. Logging levels are typically dealt with as "x and above", so having a
default here of logging.ERROR "feels" like it should only print anything at or
above ERROR level. wdyt?

+  """Momentarilly suppress logging events from all loggers.
+
+  TODO(jbudorick): This is not thread safe. Log events from other threads might
+  also inadvertently dissapear.
+
+  Example:
+
+    with logging_utils.SuppressLogging():
+      # all but CRITICAL logging messages are suppressed
+      logging.info('just doing some thing') # not shown
+      logging.critical('something really bad happened') # still shown
+
+  Args:
+    level: logging events with this or lower levels are suppressed.
+  """
+  logging.disable(level)
+  yield
+  logging.disable(logging.NOTSET)