Fix classnotfound when unmarshalling suggestions

Add proguard rule keeping parcelables

Test: installGoogleRelease and verify error is gone

Bug: 34127945
Change-Id: I186624d78e708e8d758adf59dfbe8c33c4c84215
diff --git a/proguard.flags b/proguard.flags
index e59e8e8..c71cc1c 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -1,5 +1,7 @@
 -useuniqueclassmembernames
 
+-keep class * implements android.os.Parcelable { *; }
+
 -keep class com.android.contacts.model.Sources {
   public <init>(...);
 }