This seems happens sometimes.

https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder/140995
https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder/140976
https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder/140975
https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder/140974
https://ci.chromium.org/buildbot/chromium.webkit/Android%20Builder/140973


WARNING:root:Unable to import cv2 due to: No module named cv2
CRITICAL:devil.utils.cmd_helper:STDERR: unable to initialize libusb: -99
ERROR:root:Dependency perfhost_trusty could not be found or fetched from cloud storage for platform linux_x86_64. Error: Traceback (most recent call last):
  File "/b/c/b/Android_Builder/src/third_party/catapult/third_party/gsutil/gsutil", line 22, in <module>
    gsutil.RunMain()
  File "/b/c/b/Android_Builder/src/third_party/catapult/third_party/gsutil/gsutil.py", line 114, in RunMain
    import gslib.__main__
  File "/b/c/b/Android_Builder/src/third_party/catapult/third_party/gsutil/gslib/__main__.py", line 39, in <module>
    import boto
  File "/b/c/b/Android_Builder/src/third_party/catapult/third_party/gsutil/third_party/boto/boto/__init__.py", line 1216, in <module>
    boto.plugin.load_plugins(config)
  File "/b/c/b/Android_Builder/src/third_party/catapult/third_party/gsutil/third_party/boto/boto/plugin.py", line 93, in load_plugins
    _import_module(file)
  File "/b/c/b/Android_Builder/src/third_party/catapult/third_party/gsutil/third_party/boto/boto/plugin.py", line 75, in _import_module
    return imp.load_module(name, file, filename, data)
  File "/usr/lib/python2.7/dist-packages/google_compute_engine/boto/compute_auth.py", line 19, in <module>
    from google_compute_engine import logger
ImportError: No module named google_compute_engine