Add gmock to hwui library

Change-Id: I1dec4cd234e5ee8bb01140b969d0cf817a849047
diff --git a/libs/hwui/tests/microbench/main.cpp b/libs/hwui/tests/microbench/main.cpp
index a0157bc..9771c85 100644
--- a/libs/hwui/tests/microbench/main.cpp
+++ b/libs/hwui/tests/microbench/main.cpp
@@ -14,6 +14,19 @@
  * limitations under the License.
  */
 
+#include "debug/GlesDriver.h"
+#include "debug/NullGlesDriver.h"
+
 #include <benchmark/benchmark.h>
 
-BENCHMARK_MAIN();
+#include <memory>
+
+using namespace android;
+using namespace android::uirenderer;
+
+int main(int argc, char** argv) {
+    debug::GlesDriver::replace(std::make_unique<debug::NullGlesDriver>());
+    benchmark::Initialize(&argc, argv);
+    benchmark::RunSpecifiedBenchmarks();
+    return 0;
+}