Add `disposition` to SecurityPolicyViolationEvent

third_party/WebKit/LayoutTests/fast/events/constructors/security-policy-violation-event-constructor.html

Index: third_party/WebKit/LayoutTests/fast/events/constructors/security-policy-violation-event-constructor.html
diff --git a/third_party/WebKit/LayoutTests/fast/events/constructors/security-policy-violation-event-constructor.html b/third_party/WebKit/LayoutTests/fast/events/constructors/security-policy-violation-event-constructor.html
index 10ffd7b2ada29b202630dc6b49c090e0b01a1c3b..14b3a5688419e7b742cd4c8ca618f61ea5cb660e 100644
--- a/third_party/WebKit/LayoutTests/fast/events/constructors/security-policy-violation-event-constructor.html
+++ b/third_party/WebKit/LayoutTests/fast/events/constructors/security-policy-violation-event-constructor.html
@@ -21,6 +21,7 @@ shouldBeEmptyString("new SecurityPolicyViolationEvent('eventType').violatedDirec
 shouldBeEmptyString("new SecurityPolicyViolationEvent('eventType').effectiveDirective");
 shouldBeEmptyString("new SecurityPolicyViolationEvent('eventType').originalPolicy");
 shouldBeEmptyString("new SecurityPolicyViolationEvent('eventType').sourceFile");
+shouldBeEqualToString("new SecurityPolicyViolationEvent('eventType').disposition", "enforce");
 shouldBe("new SecurityPolicyViolationEvent('eventType').lineNumber", "0");
 shouldBe("new SecurityPolicyViolationEvent('eventType').columnNumber", "0");
 shouldBe("new SecurityPolicyViolationEvent('eventType').statusCode", "0");
@@ -38,6 +39,9 @@ shouldBeTrue("new SecurityPolicyViolationEvent('eventType', { cancelable: true }
     shouldBeEqualToString("new SecurityPolicyViolationEvent('eventType', { " + member + ": 'foo' })." + member, "foo");
 });
 
+// Enum members throw on unknown initializer values.

[Sergey Shekyan, 2016/09/21 21:35:07]

I don't like this, honestly. Should I introduce an unknown state of disposition
for cases like this?

[Mike West, 2016/09/29 10:11:49]

This is how enums work. *shrug* I think the behavior is fine; we are supremely
unlikely to add dispositions to CSP in the future.

+shouldThrow("new SecurityPolicyViolationEvent('eventType', { disposition: 'foo' }).disposition");
+
 // Number members are passed.
 ["lineNumber", "columnNumber", "statusCode"].forEach(function(member) {
     shouldBe("new SecurityPolicyViolationEvent('eventType', { " + member + ": 42 })." + member, "42");