Implement drawLayers() with buffer source.

Bug: 118461793
Change-Id: Icce51ba6d7f31ff370fb281867c7b663449543a6
Test: librenderengine_test
diff --git a/libs/renderengine/Android.bp b/libs/renderengine/Android.bp
index d872f02..ac053f3 100644
--- a/libs/renderengine/Android.bp
+++ b/libs/renderengine/Android.bp
@@ -26,6 +26,7 @@
         "libgui",
         "liblog",
         "libnativewindow",
+        "libsync",
         "libui",
         "libutils",
     ],