Implement minlength for <input> and <textarea>.

Source/platform/text/PlatformLocale.cpp

Index: Source/platform/text/PlatformLocale.cpp
diff --git a/Source/platform/text/PlatformLocale.cpp b/Source/platform/text/PlatformLocale.cpp
index 01387a47ad139d906db0f6e10c29b061fbd7ac76..f98e0d82c654f03ef2e068424c520277ac970255 100644
--- a/Source/platform/text/PlatformLocale.cpp
+++ b/Source/platform/text/PlatformLocale.cpp
@@ -213,6 +213,11 @@ String Locale::validationMessageTooLongText(unsigned valueLength, int maxLength)
     return queryString(WebLocalizedString::ValidationTooLong, convertToLocalizedNumber(String::number(valueLength)), convertToLocalizedNumber(String::number(maxLength)));
 }
 
+String Locale::validationMessageTooShortText(unsigned valueLength, int minLength)
+{
+    return queryString(WebLocalizedString::ValidationTooShort, convertToLocalizedNumber(String::number(valueLength)), convertToLocalizedNumber(String::number(minLength)));
+}
+
 String Locale::weekFormatInLDML()
 {
     String templ = queryString(WebLocalizedString::WeekFormatTemplate);