Add slow test decorator

tools/chrome_proxy/webdriver/compression_regression.py

Index: tools/chrome_proxy/webdriver/compression_regression.py
diff --git a/tools/chrome_proxy/webdriver/compression_regression.py b/tools/chrome_proxy/webdriver/compression_regression.py
index 934fb93ce4c7e61ed8c21b9afb02b9de27dd2c6a..808e98fad85a4821e0e0607bcad059d64eff339a 100644
--- a/tools/chrome_proxy/webdriver/compression_regression.py
+++ b/tools/chrome_proxy/webdriver/compression_regression.py
@@ -12,6 +12,7 @@ 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
@@ -81,6 +82,7 @@ class CompressionRegression(IntegrationTest):
   classified as a regression test.
   """
 
+  @Slow
   @NotAndroid
   def testCompression(self):
       """This function is the main test function for regression compression