Revert of Remove unused imports in webkitpy.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/test.py

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 import base64
+import copy
+import sys
 import time
 
 from webkitpy.layout_tests.port.base import Port, VirtualTestSuite
 from webkitpy.layout_tests.port.driver import DeviceFailure, Driver, DriverOutput
 from webkitpy.layout_tests.models.test_configuration import TestConfiguration
 from webkitpy.layout_tests.models import test_run_results
+from webkitpy.common.system.filesystem_mock import MockFileSystem
 from webkitpy.common.system.crashlogs import CrashLogs
 
 
 # This sets basic expectations for a test. Each individual expectation
 # can be overridden by a keyword argument in TestList.add().
 class TestInstance(object):
 
     def __init__(self, name):
         self.name = name
         self.base = name[(name.rfind("/") + 1):name.rfind(".")]
@@ skipping 611 matching lines @@
         else:
             image = test.actual_image
         return DriverOutput(actual_text, image, test.actual_checksum, audio,
                             crash=(crash or web_process_crash), crashed_process_name=crashed_process_name,
                             crashed_pid=crashed_pid, crash_log=crash_log,
                             test_time=time.time() - start_time, timeout=test.timeout, error=test.error, pid=self.pid,
                             leak=test.leak)
 
     def stop(self):
         self.started = False