diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
index e9dbbc273..a755f90d5 100644
--- a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateSession.java
@@ -70,7 +70,17 @@ public abstract class PersonalizationDictionaryUpdateSession {
         unsetPredictionDictionary();
     }
 
-    public void addToPersonalizationDictionary(
+    public void addBigramToPersonalizationDictionary(String word0, String word1, boolean isValid,
+            int frequency) {
+        final DynamicPredictionDictionaryBase dictionary = getPredictionDictionary();
+        if (dictionary == null) {
+            return;
+        }
+        dictionary.addToPersonalizationPredictionDictionary(word0, word1, isValid);
+    }
+
+    // Bulk import
+    public void addBigramsToPersonalizationDictionary(
             final ArrayList<PersonalizationLanguageModelParam> lmParams) {
         final DynamicPredictionDictionaryBase dictionary = getPredictionDictionary();
         if (dictionary == null) {
diff --git a/java/src/com/android/inputmethod/latin/utils/StringUtils.java b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
index f88f2cca7..4ddd3c51d 100644
--- a/java/src/com/android/inputmethod/latin/utils/StringUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/StringUtils.java
@@ -345,4 +345,14 @@ public final class StringUtils {
         // Otherwise, it doesn't look like an URL.
         return false;
     }
+
+    public static boolean isEmptyStringOrWhiteSpaces(String s) {
+        final int N = codePointCount(s);
+        for (int i = 0; i < N; ++i) {
+            if (!Character.isWhitespace(s.codePointAt(i))) {
+                return false;
+            }
+        }
+        return true;
+    }
 }