sde: Snapdragon Display Engine (SDE) implementation skeleton.

Define classes and files required for SDE implementation.

Change-Id: Ic2d8572699b895f1980c7c127301e9ce0d4c8b03
diff --git a/Android.mk b/Android.mk
index d8b168d..4a951c8 100644
--- a/Android.mk
+++ b/Android.mk
@@ -1,6 +1,16 @@
-display-hals := libgralloc libgenlock libcopybit liblight
-display-hals += libhwcomposer liboverlay libqdutils libhdmi libqservice
-display-hals += libmemtrack
+# This flag will be set to true during migration to Snapdragon Display Engine.
+TARGET_USES_SDE = false
+
+display-hals := libgralloc libcopybit liblight libmemtrack
+
+ifeq ($(TARGET_USES_SDE), true)
+    sde-libs := displayengine/libs
+    display-hals += $(sde-libs)/utils $(sde-libs)/core $(sde-libs)/hwc
+else
+    display-hals += libgenlock libhwcomposer liboverlay libqdutils libhdmi
+    display-hals += libqservice
+endif
+
 ifeq ($(call is-vendor-board-platform,QCOM),true)
     include $(call all-named-subdir-makefiles,$(display-hals))
 else