Plumb context through for serialization.

Change-Id: I2a49f57aa7576604deeac898a7cceb36ae68d66f
diff --git a/rsElement.cpp b/rsElement.cpp
index fb2892c..4424938 100644
--- a/rsElement.cpp
+++ b/rsElement.cpp
@@ -92,7 +92,7 @@
     }
 }
 
-void Element::serialize(OStream *stream) const {
+void Element::serialize(Context *rsc, OStream *stream) const {
     // Need to identify ourselves
     stream->addU32((uint32_t)getClassId());
 
@@ -106,7 +106,7 @@
     for (uint32_t ct = 0; ct < mFieldCount; ct++) {
         stream->addString(&mFields[ct].name);
         stream->addU32(mFields[ct].arraySize);
-        mFields[ct].e->serialize(stream);
+        mFields[ct].e->serialize(rsc, stream);
     }
 }