ResearchLog refactor

- new package: com.android.inputmethod.research

multi-project commit with Ic0a5744f3160d13218addd589890623c0d120ffc

Bug: 6188932

Change-Id: Icf8d4a40a5725401799be6e209a640d99a5f34c4
diff --git a/java/proguard.flags b/java/proguard.flags
index 1711b99..b66c9a9 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -44,7 +44,7 @@
   <init>(...);
 }
 
--keep class com.android.inputmethod.latin.ResearchLogger {
+-keep class com.android.inputmethod.research.ResearchLogger {
   void flush();
   void publishCurrentLogUnit(...);
 }