Rename SCC multi-thread test appropriately

This CL moves the existing test for SCC tools with multi-threaded
encoding to a new test suite ScreenContentToolsMultiThreadTestLarge
so that the same gets invoked during the nightly thread sanitizer
tests. This test had been introduced in the following CL:
https://aomedia-review.googlesource.com/c/aom/+/156486

BUG=aomedia:3268

Change-Id: I4af0d745b43ee3faa05391df6548efb0f641bf0f
diff --git a/test/screen_content_test.cc b/test/screen_content_test.cc
index fad85ed..4d3e09a 100644
--- a/test/screen_content_test.cc
+++ b/test/screen_content_test.cc
@@ -106,7 +106,15 @@
   //      << "Failed detection of screen content(lowres)";
 }
 
-TEST_P(ScreenContentToolsTestLarge, ScreenContentMultiThreadedEncoding) {
+AV1_INSTANTIATE_TEST_SUITE(ScreenContentToolsTestLarge,
+                           ::testing::Values(::libaom_test::kOnePassGood,
+                                             ::libaom_test::kTwoPassGood),
+                           ::testing::Values(AOM_Q));
+
+class ScreenContentToolsMultiThreadTestLarge
+    : public ScreenContentToolsTestLarge {};
+
+TEST_P(ScreenContentToolsMultiThreadTestLarge, ScreenContentToolsTest) {
   // Don't force screen content, however as the input is screen content
   // allow_screen_content_tools should still be turned on even with
   // multi-threaded encoding.
@@ -120,7 +128,7 @@
       << "Failed detection of screen content";
 }
 
-AV1_INSTANTIATE_TEST_SUITE(ScreenContentToolsTestLarge,
+AV1_INSTANTIATE_TEST_SUITE(ScreenContentToolsMultiThreadTestLarge,
                            ::testing::Values(::libaom_test::kOnePassGood,
                                              ::libaom_test::kTwoPassGood),
                            ::testing::Values(AOM_Q));