Implement minlength for <input> and <textarea>.

LayoutTests/fast/forms/ValidityState-tooShort-input-expected.txt

Index: LayoutTests/fast/forms/ValidityState-tooShort-input-expected.txt
diff --git a/LayoutTests/fast/forms/ValidityState-tooShort-input-expected.txt b/LayoutTests/fast/forms/ValidityState-tooShort-input-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b58ee362fb3e1ef7a208efdf74cfb55defcc6ac
--- /dev/null
+++ b/LayoutTests/fast/forms/ValidityState-tooShort-input-expected.txt
@@ -0,0 +1,39 @@
+Tests for tooShort flag with <input> elements.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+No minlength and no value
+PASS input.validity.tooShort is false
+
+Non-dirty value
+PASS input.value.length is 2
+PASS input.validity.tooShort is false
+PASS input.value.length is 1
+PASS input.validity.tooShort is false
+
+Dirty value and longer than minLength
+PASS input.value.length is 1
+PASS input.validity.tooShort is true
+PASS input.value.length is 0
+PASS input.validity.tooShort is false
+PASS input.value.length is 2
+PASS input.validity.tooShort is true
+PASS input.value.length is 3
+PASS input.validity.tooShort is false
+
+Sets a value via DOM property
+PASS input.validity.tooShort is false
+
+Disabling makes the control valid
+PASS input.validity.tooShort is true
+PASS input.disabled = true; input.validity.tooShort is false
+PASS input.disabled = false; input.validity.tooShort is true
+
+Change the type with a too long value
+PASS input.validity.tooShort is true
+PASS input.type = "number"; input.validity.tooShort is false
+PASS successfullyParsed is true
+
+TEST COMPLETE
+