Add implementation for hwbinder benchmark service.

Bug:32279499
Test: make android.hardware.tests.libhwbinder@1.0-impl
Change-Id: I75056afa32b8189020608779ec495659ea35ed48
diff --git a/tests/libhwbinder/1.0/default/Benchmark.h b/tests/libhwbinder/1.0/default/Benchmark.h
new file mode 100644
index 0000000..454fdf2
--- /dev/null
+++ b/tests/libhwbinder/1.0/default/Benchmark.h
@@ -0,0 +1,31 @@
+#ifndef HIDL_GENERATED_android_hardware_benchmark_V1_0_Benchmark_H_
+#define HIDL_GENERATED_android_hardware_benchmark_V1_0_Benchmark_H_
+
+#include <android/hardware/tests/libhwbinder/1.0/IBenchmark.h>
+#include <hidl/Status.h>
+
+namespace android {
+namespace hardware {
+namespace tests {
+namespace libhwbinder {
+namespace V1_0 {
+namespace implementation {
+
+using ::android::hardware::tests::libhwbinder::V1_0::IBenchmark;
+using ::android::hardware::Return;
+using ::android::hardware::hidl_vec;
+
+struct Benchmark : public IBenchmark {
+  virtual Return<void> sendVec(const hidl_vec<uint8_t>& data, sendVec_cb _hidl_cb)  override;
+};
+
+extern "C" IBenchmark* HIDL_FETCH_IBenchmark(const char* name);
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace libhwbinder
+}  // namespace tests
+}  // namespace hardware
+}  // namespace android
+
+#endif  // HIDL_GENERATED_android_hardware_benchmark_V1_0_Benchmark_H_