Create a new KeyboardLayout class to represent the layout.

Change-Id: Ia08c8194f460271c831702675cfb687ab9f6678b
diff --git a/java/proguard.flags b/java/proguard.flags
index 0c5ad9f..c832a88 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -22,3 +22,7 @@
 -keep class com.android.inputmethod.latin.NgramContext
 -keep class com.android.inputmethod.latin.makedict.ProbabilityInfo
 -keep class com.android.inputmethod.latin.utils.LanguageModelParam
+
+# TODO: remove once used in code.
+-keep class com.android.inputmethod.keyboard.KeyboardLayout { *; }
+