Implement minlength for <input> and <textarea>.

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

Index: LayoutTests/fast/forms/ValidityState-tooShort-textarea-expected.txt
diff --git a/LayoutTests/fast/forms/ValidityState-tooShort-textarea-expected.txt b/LayoutTests/fast/forms/ValidityState-tooShort-textarea-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..3784b361fbc2c43401235ceb299f967dee5fd6e9
--- /dev/null
+++ b/LayoutTests/fast/forms/ValidityState-tooShort-textarea-expected.txt
@@ -0,0 +1,46 @@
+Tests for tooShort flag with <textarea> elements.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+No minlength and no value
+PASS textarea.validity.tooShort is false
+
+Non-dirty value
+PASS textarea.value.length is 2
+PASS textarea.validity.tooShort is false
+PASS textarea.value.length is 1
+PASS textarea.validity.tooShort is false
+
+Dirty value and longer than minLength
+PASS textarea.value.length is 1
+PASS textarea.validity.tooShort is true
+PASS textarea.value.length is 0
+PASS textarea.validity.tooShort is false
+PASS textarea.value.length is 2
+PASS textarea.validity.tooShort is true
+PASS textarea.value.length is 3
+PASS textarea.validity.tooShort is false
+
+Sets a value via DOM property
+PASS textarea.validity.tooShort is false
+
+Disabling makes the control valid
+PASS textarea.validity.tooShort is true
+PASS textarea.disabled = true; textarea.validity.tooShort is false
+PASS textarea.disabled = false; textarea.validity.tooShort is true
+
+A value set by resetting a form doesn't make tooShort true.
+PASS textarea.validity.tooShort is true
+PASS textarea.value is "ab"
+PASS textarea.validity.tooShort is false
+
+A value set by a child node change doesn't make tooShort true.
+PASS textarea.validity.tooShort is false
+PASS textarea.value is "a"
+PASS textarea.validity.tooShort is false
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
+