Implement reportValidity()

LayoutTests/fast/forms/reportValidity-invalid-expected.txt

+ValidationMessageClient: main-message=Please fill out this field. sub-message=
+ValidationMessageClient: main-message=Please match the requested format. sub-message=
+ValidationMessageClient: main-message=Please fill out this field. sub-message=
+ValidationMessageClient: main-message=Please select an item in the list. sub-message=
+ValidationMessageClient: main-message=Please fill out this field. sub-message=
+This test checks if reportValidity() returns correctly a false (meaning error) result on invalid elements, and returns a true result on a blank but valid elements. Blank but non-placeholder label options are valid.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+     
+PASS reportValidityFor("input-empty") is false
+PASS document.activeElement is $("input-empty")
+PASS reportValidityFor("input-pattern-mismatch") is false
+PASS document.activeElement is $("input-pattern-mismatch")
+PASS reportValidityFor("textarea") is false
+PASS document.activeElement is $("textarea")
+PASS reportValidityFor("select-no-explicit-value") is true
+PASS document.activeElement is not $("select-no-explicit-value")
+PASS reportValidityFor("select-placeholder") is false
+PASS document.activeElement is $("select-placeholder")
+PASS reportValidityFor("select-non-placeholder") is true
+PASS document.activeElement is not $("select-non-placeholder")
+PASS reportValidityFor("sad-form") is false
+PASS document.activeElement is $("input-empty")
+PASS successfullyParsed is true
+
+TEST COMPLETE
+