Fix the regression tests

Change-Id: I42150fbb05e5b070aca81a36f18fb069d7a8b810
diff --git a/java/proguard.flags b/java/proguard.flags
index a0010f9..2ee1a26 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -40,6 +40,10 @@
   void setLogFileManager(...);
 }
 
+-keep class com.android.inputmethod.keyboard.KeyboardSet$Builder {
+  void setTouchPositionCorrectionEnabled(...);
+}
+
 # The support library contains references to newer platform versions.
 # Don't warn about those in case this app is linking against an older
 # platform version.  We know about them, and they are safe.