kms-throughput benchmark

This benchmark aims to maximize memory bandwidth used by the display
processor.  It reports a histogram of frame-to-frame time.

Test: [on coral] /data/local/tmp/kms_throughput
Bug: 143118270
Change-Id: Iaf3bb20848886b9596e0e1d67167861a301c6c91
diff --git a/Android.bp b/Android.bp
index 477efe2..0a32ca3 100644
--- a/Android.bp
+++ b/Android.bp
@@ -83,3 +83,9 @@
     defaults: ["igt-gpu-tools-test-defaults"],
     srcs: ["tests/kms_vblank.c"],
 }
+
+cc_test {
+    name: "kms_throughput",
+    defaults: ["igt-gpu-tools-test-defaults"],
+    srcs: ["benchmarks/kms_throughput.c"],
+}