test-hwc2: virtual displays

Test: Add "#define HAVE_NO_SURFACE_FLINGER" to
      frameworks/native/libs/gui/BufferQueueCore.cpp.
      Recompile and flash.
      Run "mm" in frameworks/native/services/surfaceflinger/tests/hwc2.
      Push test-hwc2 to device.
      Run "adb root && adb shell stop".
      Run test case. Ex: "./test-hwc2"

Change-Id: Ia10ec761712ee03f56782e3df2d6eabf7fb77760
diff --git a/services/surfaceflinger/tests/hwc2/Android.mk b/services/surfaceflinger/tests/hwc2/Android.mk
index f7403cf..b8c2133 100644
--- a/services/surfaceflinger/tests/hwc2/Android.mk
+++ b/services/surfaceflinger/tests/hwc2/Android.mk
@@ -47,6 +47,7 @@
     Hwc2TestLayer.cpp \
     Hwc2TestLayers.cpp \
     Hwc2TestBuffer.cpp \
-    Hwc2TestClientTarget.cpp
+    Hwc2TestClientTarget.cpp \
+    Hwc2TestVirtualDisplay.cpp
 
 include $(BUILD_NATIVE_TEST)