Tune key label size of Khmer keyboard using autoScale

Bug: 11546184
Change-Id: I187b1e4205146f517c90de33aee9339d1d91f5b9
diff --git a/java/res/xml/rowkeys_khmer3.xml b/java/res/xml/rowkeys_khmer3.xml
index ff6c9ca..f35ba5c 100644
--- a/java/res/xml/rowkeys_khmer3.xml
+++ b/java/res/xml/rowkeys_khmer3.xml
@@ -70,7 +70,7 @@
             <!-- U+17C4/U+17C7: "ោះ" KHMER VOWEL SIGN OO/KHMER SIGN REAHMUK -->
             <Key
                 latin:keyLabel="&#x17C4;&#x17C7;"
-                latin:keyLabelFlags="fontNormal" />
+                latin:keyLabelFlags="fontNormal|followKeyLetterRatio|autoScale" />
             <!-- U+17C9: "៉" KHMER SIGN MUUSIKATOAN -->
             <Key
                 latin:keyLabel="&#x17C9;"