vp9-datarate unittests: Include coverage up to speed 8.

Change-Id: I8529cd04ea4f95d21d83f87d56d6dd882d0a5636
diff --git a/test/datarate_test.cc b/test/datarate_test.cc
index acbe02e..821a9ec 100644
--- a/test/datarate_test.cc
+++ b/test/datarate_test.cc
@@ -1044,8 +1044,8 @@
 VP9_INSTANTIATE_TEST_CASE(DatarateTestVP9Large,
                           ::testing::Values(::libvpx_test::kOnePassGood,
                                             ::libvpx_test::kRealTime),
-                          ::testing::Range(2, 7));
+                          ::testing::Range(2, 9));
 VP9_INSTANTIATE_TEST_CASE(DatarateOnePassCbrSvc,
                           ::testing::Values(::libvpx_test::kRealTime),
-                          ::testing::Range(5, 8));
+                          ::testing::Range(5, 9));
 }  // namespace