Add slow test decorator

tools/chrome_proxy/webdriver/compression_regression.py

 # Copyright 2017 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 datetime
 import json
 import math
 import subprocess
 import time
 
 import common
 from common import TestDriver
 from common import IntegrationTest
 from decorators import NotAndroid
+from decorators import Slow
 
 # The maximum number of data points that will be saved.
 MAX_DATA_POINTS = 365
 
 # The number of days in the past to compute the average of for regression
 # alerting.
 ALERT_WINDOW = 31
 
 # The amount of tolerable difference a single data point can be away from the
 # average without alerting. This is a percentage from 0.0 to 1.0 inclusive.
@@ skipping 49 matching lines @@
   }
   where keys are the content type with its compression value.
 
   Due to the complexity of several methods in this class, a number of local
   unit tests can be found at the bottom of this file.
 
   Please note that while this test uses the IntegrationTest framework, it is
   classified as a regression test.
   """
 
+  @Slow
   @NotAndroid
   def testCompression(self):
       """This function is the main test function for regression compression
       checking and facilitates the test with all of the helper functions'
       behavior.
       """
       compression_average = self.getCurrentCompressionMetricsWithRetry()
       self.fetchFromGoogleStorage()
       data = {}
       with open(DATA_FILE, 'r') as data_fp:
@@ skipping 277 matching lines @@
     for i in range(ALERT_WINDOW):
       date_obj = start_date + datetime.timedelta(days=i)
       datestamp = date_obj.strftime(DATE_FORMAT)
       data[datestamp] = {'mp4': 0.9}
     self.assertRaises(Exception, self.checkForRegression, data, {'mp4':
       (0.9 - THRESHOLD - 0.01)})
 
 
 if __name__ == '__main__':
   IntegrationTest.RunAllTests()