AAPT2: Add Inline Complex XML support

See: https://developer.android.com/guide/topics/resources/complex-xml-resources.html

Change-Id: I8274c85e25cabf90423141c228697e873167d136
diff --git a/tools/aapt2/Debug.h b/tools/aapt2/Debug.h
index fbe6477..c0fcbf1 100644
--- a/tools/aapt2/Debug.h
+++ b/tools/aapt2/Debug.h
@@ -19,6 +19,7 @@
 
 #include "Resource.h"
 #include "ResourceTable.h"
+#include "xml/XmlDom.h"
 
 // Include for printf-like debugging.
 #include <iostream>
@@ -34,6 +35,7 @@
     static void printStyleGraph(ResourceTable* table,
                                 const ResourceName& targetStyle);
     static void dumpHex(const void* data, size_t len);
+    static void dumpXml(xml::XmlResource* doc);
 };
 
 } // namespace aapt