Test that plaintext can't be read from disk for encrypted files.

Bug: 36029169
Test: tested by hand on Taimen
Change-Id: I5717a8630bb2c8d8fe5c343d519c4e59862ecbdf
diff --git a/Android.bp b/Android.bp
index 8827d25..4432153 100644
--- a/Android.bp
+++ b/Android.bp
@@ -91,9 +91,11 @@
 
     srcs: [
         "Benchmark.cpp",
+        "CheckEncryption.cpp",
         "Devmapper.cpp",
         "EncryptInplace.cpp",
         "Ext4Crypt.cpp",
+        "FileDeviceUtils.cpp",
         "IdleMaint.cpp",
         "KeyBuffer.cpp",
         "KeyStorage.cpp",