Fix build. optional tests were broken.

Change-Id: Iba9f5cb57f134559e1f9c55e293578d9f5d8cb96
diff --git a/libs/gui/tests/SurfaceTextureClient_test.cpp b/libs/gui/tests/SurfaceTextureClient_test.cpp
index 459b001..989fcef 100644
--- a/libs/gui/tests/SurfaceTextureClient_test.cpp
+++ b/libs/gui/tests/SurfaceTextureClient_test.cpp
@@ -18,7 +18,10 @@
 //#define LOG_NDEBUG 0
 
 #include <EGL/egl.h>
+#include <GLES2/gl2.h>
+
 #include <gtest/gtest.h>
+#include <gui/GLConsumer.h>
 #include <gui/Surface.h>
 #include <system/graphics.h>
 #include <utils/Log.h>