Add complex layout to benchmark

Summary: Add a more complex benchmark which actually take a couple milliseconds to perform. This makes it easier to see if optimizations have any effect. More styles should be added later to make sure the benchmarks covers most of the csslayout code.

Reviewed By: gkassabli

Differential Revision: D4101780

fbshipit-source-id: 6bdf703edfbe64c47c77e04ef1ca946f4b75d093

benchmark/CSSBenchmark.c

@@ -75,4 +75,45 @@ CSS_BENCHMARKS({
     CSSNodeFreeRecursive(root);
   });
 
+  CSS_BENCHMARK("Huge nested layout", {
+    const CSSNodeRef root = CSSNodeNew();
+
+    for (uint32_t i = 0; i < 10; i++) {
+      const CSSNodeRef child = CSSNodeNew();
+      CSSNodeStyleSetFlexGrow(child, 1);
+      CSSNodeStyleSetWidth(child, 10);
+      CSSNodeStyleSetHeight(child, 10);
+      CSSNodeInsertChild(root, child, 0);
+
+      for (uint32_t ii = 0; ii < 10; ii++) {
+        const CSSNodeRef grandChild = CSSNodeNew();
+        CSSNodeStyleSetFlexDirection(grandChild, CSSFlexDirectionRow);
+        CSSNodeStyleSetFlexGrow(grandChild, 1);
+        CSSNodeStyleSetWidth(grandChild, 10);
+        CSSNodeStyleSetHeight(grandChild, 10);
+        CSSNodeInsertChild(child, grandChild, 0);
+
+        for (uint32_t iii = 0; iii < 10; iii++) {
+          const CSSNodeRef grandGrandChild = CSSNodeNew();
+          CSSNodeStyleSetFlexGrow(grandGrandChild, 1);
+          CSSNodeStyleSetWidth(grandGrandChild, 10);
+          CSSNodeStyleSetHeight(grandGrandChild, 10);
+          CSSNodeInsertChild(grandChild, grandGrandChild, 0);
+
+          for (uint32_t iii = 0; iii < 10; iii++) {
+            const CSSNodeRef grandGrandGrandChild = CSSNodeNew();
+            CSSNodeStyleSetFlexDirection(grandGrandGrandChild, CSSFlexDirectionRow);
+            CSSNodeStyleSetFlexGrow(grandGrandGrandChild, 1);
+            CSSNodeStyleSetWidth(grandGrandGrandChild, 10);
+            CSSNodeStyleSetHeight(grandGrandGrandChild, 10);
+            CSSNodeInsertChild(grandGrandChild, grandGrandGrandChild, 0);
+          }
+        }
+      }
+    }
+
+    CSSNodeCalculateLayout(root, CSSUndefined, CSSUndefined, CSSDirectionLTR);
+    CSSNodeFreeRecursive(root);
+  });
+
 });