Add a stretchy benchmark

Test: this
Bug: 187718492
Change-Id: Idaf3a90567a4f90c7089159b496ddf4aac24bf05
diff --git a/libs/hwui/tests/common/TestScene.h b/libs/hwui/tests/common/TestScene.h
index 91022cf..eaf5988 100644
--- a/libs/hwui/tests/common/TestScene.h
+++ b/libs/hwui/tests/common/TestScene.h
@@ -35,7 +35,8 @@
 class TestScene {
 public:
     struct Options {
-        int count = 0;
+        int frameCount = 150;
+        int repeatCount = 1;
         int reportFrametimeWeight = 0;
         bool renderOffscreen = true;
     };