AAPT2: Better debugging output

Test: make aapt2_tests
Change-Id: I7778b773201381538dc1f2e376abee4eb33e44c0
diff --git a/tools/aapt2/Android.bp b/tools/aapt2/Android.bp
index ae67f61..eb3a99a 100644
--- a/tools/aapt2/Android.bp
+++ b/tools/aapt2/Android.bp
@@ -113,6 +113,7 @@
         "optimize/VersionCollapser.cpp",
         "process/SymbolTable.cpp",
         "split/TableSplitter.cpp",
+        "text/Printer.cpp",
         "text/Unicode.cpp",
         "text/Utf8Iterator.cpp",
         "util/BigBuffer.cpp",