drm_hwcomposer: Enable and refactor Separate Rects test

Plumb through the existing test based on known sample data for the
Separate Rect algorithm via Android's NATIVE_TEST harness.

Signed-off-by: Rhys Kidd <rhyskidd@gmail.com>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
diff --git a/tests/Android.mk b/tests/Android.mk
index 5bbda93..3b9e0a2 100644
--- a/tests/Android.mk
+++ b/tests/Android.mk
@@ -3,10 +3,12 @@
 include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := \
+	separate_rects_test.cpp \
 	worker_test.cpp
 
 LOCAL_MODULE := hwc-drm-tests
 LOCAL_STATIC_LIBRARIES := libdrmhwc_utils
+LOCAL_SHARED_LIBRARIES := hwcomposer.drm
 LOCAL_C_INCLUDES := external/drm_hwcomposer
 
 include $(BUILD_NATIVE_TEST)