Create a Mobly snippet for Nearby Mainline Fast Pair multidevice tests.

Design doc: go/nearby-mainline-snippet
Test: atest --host NearbyMultiDevicesClientsRoboTest
Ignore-AOSP-First: Nearby is not yet in AOSP.
Bug: 214015364
Change-Id: Id8f551db9cbbe60f4ba0303851de66a644f55c4c
diff --git a/nearby/tests/multidevices/clients/proguard.flags b/nearby/tests/multidevices/clients/proguard.flags
new file mode 100644
index 0000000..ec8f526
--- /dev/null
+++ b/nearby/tests/multidevices/clients/proguard.flags
@@ -0,0 +1,24 @@
+# Keep all snippet classes.
+-keep class android.nearby.multidevices.** {
+     *;
+}
+
+# Do not touch Mobly.
+-keep class com.google.android.mobly.** {
+  *;
+}
+
+# Keep names for easy debugging.
+-dontobfuscate
+
+# Necessary to allow debugging.
+-keepattributes *
+
+# By default, proguard leaves all classes in their original package, which
+# needlessly repeats com.google.android.apps.etc.
+-repackageclasses ""
+
+# Allows proguard to make private and protected methods and fields public as
+# part of optimization. This lets proguard inline trivial getter/setter
+# methods.
+-allowaccessmodification
\ No newline at end of file