Add setFrameRateCategory surface API

Bug: 284911776
Test: atest CtsSurfaceControlTestsStaging
Test: atest libsurfaceflinger_unittest
Change-Id: Ia804a63198ff096d1e5ffedf6046a0350963b8ed
diff --git a/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h b/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h
index f64ba2a..93438d8 100644
--- a/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h
+++ b/services/surfaceflinger/tests/unittests/LayerHierarchyTest.h
@@ -335,6 +335,17 @@
         mLifecycleManager.applyTransactions(transactions);
     }
 
+    void setFrameRateCategory(uint32_t id, int8_t frameRateCategory) {
+        std::vector<TransactionState> transactions;
+        transactions.emplace_back();
+        transactions.back().states.push_back({});
+
+        transactions.back().states.front().state.what = layer_state_t::eFrameRateCategoryChanged;
+        transactions.back().states.front().layerId = id;
+        transactions.back().states.front().state.frameRateCategory = frameRateCategory;
+        mLifecycleManager.applyTransactions(transactions);
+    }
+
     void setRoundedCorners(uint32_t id, float radius) {
         std::vector<TransactionState> transactions;
         transactions.emplace_back();