Force to disable slimming paint on Android when running layout tests

Tools/Scripts/webkitpy/layout_tests/port/android.py

Index: Tools/Scripts/webkitpy/layout_tests/port/android.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/port/android.py b/Tools/Scripts/webkitpy/layout_tests/port/android.py
index 65feb52e02ddb845a9b6049d55eef09621464d5c..4888e0d1e6014849a9efae5a14b1360a85bbf92f 100644
--- a/Tools/Scripts/webkitpy/layout_tests/port/android.py
+++ b/Tools/Scripts/webkitpy/layout_tests/port/android.py
@@ -1066,7 +1066,12 @@ class ChromiumAndroidDriver(driver.Driver):
         return self._android_commands.adb_command() + ['shell']
 
     def _android_driver_cmd_line(self, pixel_tests, per_test_args):
-        return driver.Driver.cmd_line(self, pixel_tests, per_test_args)
+        # FIXME: We can't enable slimming paint before crbug.com/439457 is fixed.
+        cmd_line = driver.Driver.cmd_line(self, pixel_tests, per_test_args)
+        if '--enable-slimming-paint' in cmd_line:
+            _log.warning('Android port doesn\'t support slimming paint because of crbug.com/439457')
+            cmd_line.remove('--enable-slimming-paint')
+        return cmd_line
 
     @staticmethod
     def _loop_with_timeout(condition, timeout_secs):