Implement minlength for <input> and <textarea>.

LayoutTests/fast/forms/ValidityState-tooLong-input.html

Index: LayoutTests/fast/forms/ValidityState-tooLong-input.html
diff --git a/LayoutTests/fast/forms/ValidityState-tooLong-input.html b/LayoutTests/fast/forms/ValidityState-tooLong-input.html
index 8a54fc51efc1fef691ce85688e32131388c9f46c..f7c5496d83b65fa250c25c289ce7b05d3477db4d 100644
--- a/LayoutTests/fast/forms/ValidityState-tooLong-input.html
+++ b/LayoutTests/fast/forms/ValidityState-tooLong-input.html
@@ -48,11 +48,19 @@ input.value = 'abcde';
 shouldBeFalse('input.validity.tooLong');
 
 debug('');
-debug('Disabled');
-input.disabled = true;
-shouldBeFalse('input.validity.tooLong');
-input.disabled = false;
+debug('Disabling makes the control valid');
+input.focus();
+input.setSelectionRange(5, 5);  // Move the cursor at the end.
+document.execCommand('delete');
+shouldBeTrue('input.validity.tooLong');
+shouldBeFalse('input.disabled = true; input.validity.tooLong');
+shouldBeTrue('input.disabled = false; input.validity.tooLong');
 
+// TODO: The grapheme test below doesn't do its job because initial value is

[keishi, 2014/10/08 09:17:49]

nit: style guideline says to use FIXME instead of TODO

[Bartek Nowierski, 2014/10/09 05:32:56]

Done.

+// always valid. After making a modificaton to trigger validity check, one can
+// see that the test would fail, which possibly reveals a code issue.

[keishi, 2014/10/08 09:17:49]

nit: This looks like a bug so maybe you can file a bug at crbug.com and add a
link here.

[Bartek Nowierski, 2014/10/09 05:32:56]

Done. https://code.google.com/p/chromium/issues/detail?id=421727

+// Once this is figured out, implement a similar test in
+// ValidityState-tooShort-input.html
 debug('');
 debug('Grapheme length is not greater than maxLength though character length is greater');
 // fancyX should be treated as 1 grapheme.