A little optimization of InputPointers.copy

Change-Id: Id83b34e076ef91e06d7c1dd2b3ee7bb64d01b8cb
diff --git a/java/proguard.flags b/java/proguard.flags
index ca205b9..376a0e0 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -20,6 +20,10 @@
   boolean equalsIgnoreCase(...);
 }
 
+-keep class com.android.inputmethod.latin.InputPointers {
+  *;
+}
+
 -keep class com.android.inputmethod.latin.spellcheck.SpellCheckerSettingsFragment {
   *;
 }