A part of efforts of unbundling LatinIME: Get rid of ICU dependency in the native code.
This is actually a back merge from the LatinIME sandbox.  Please refer to
http://arvarest.i.corp.google.com:8080/#change,77

Change-Id: I3ff3781903d5c642c662c2d744f808be7e4d8997
diff --git a/native/src/char_utils.h b/native/src/char_utils.h
new file mode 100644
index 0000000..921ecb4
--- /dev/null
+++ b/native/src/char_utils.h
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_CHAR_UTILS_H
+#define LATINIME_CHAR_UTILS_H
+
+namespace latinime {
+
+unsigned short latin_tolower(unsigned short c);
+
+}; // namespace latinime
+
+#endif // LATINIME_CHAR_UTILS_H