sde: Define rect utility functions.

 Define rect helper functions used by SDE.

Change-Id: Ib8e0bc9493a40fa59a3cf90a115352edd4264a92
diff --git a/displayengine/libs/utils/Android.mk b/displayengine/libs/utils/Android.mk
index db97dd5..264c40a 100644
--- a/displayengine/libs/utils/Android.mk
+++ b/displayengine/libs/utils/Android.mk
@@ -8,6 +8,6 @@
                                  -Wconversion -Wall -Werror \
                                  -DLOG_TAG=\"SDE\"
 LOCAL_SHARED_LIBRARIES        := libcutils
-LOCAL_SRC_FILES               := debug_android.cpp
+LOCAL_SRC_FILES               := debug_android.cpp rect.cpp
 
 include $(BUILD_SHARED_LIBRARY)