--experimental_android_use_singlejar_for_multidex compresses classes*.dex

Currently, setting this flag on a native multidex build results in classes*.dex being stored in the APK uncompressed which is certainly not good.

--
MOS_MIGRATED_REVID=140561305
diff --git a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java
index 834b1e1..e77b66a 100644
--- a/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java
+++ b/src/main/java/com/google/devtools/build/lib/rules/android/AndroidBinary.java
@@ -1566,6 +1566,7 @@
     if (ruleContext.getFragment(AndroidConfiguration.class).useSingleJarForMultidex()) {
       ruleContext.registerAction(singleJarSpawnActionBuilder(ruleContext)
           .addArgument("--exclude_build_data")
+          .addArgument("--dont_change_compression")
           .addArgument("--sources")
           .addInputArgument(inputZip)
           .addArgument("--output")