add missing externs to repo

externs/webextension_polyfill/webrequest/BlockingResponse.hx

@@ -0,0 +1,52 @@
+package webextension_polyfill.webrequest;
+
+/**
+	Returns value for event handlers that have the 'blocking' extraInfoSpec applied. Allows the event handler to modify
+	network requests.
+**/
+typedef BlockingResponse = {
+	/**
+		If true, the request is cancelled. Used in onBeforeRequest, this prevents the request from being sent.
+		Optional.
+	**/
+	@:optional
+	var cancel : Bool;
+	/**
+		Only used as a response to the onBeforeRequest and onHeadersReceived events. If set,
+		the original request is prevented from being sent/completed and is instead redirected to the given URL.
+		Redirections to non-HTTP schemes such as data: are allowed. Redirects initiated by a redirect action use the original
+		request method for the redirect, with one exception: If the redirect is initiated at the onHeadersReceived stage,
+		then the redirect will be issued using the GET method.
+		Optional.
+	**/
+	@:optional
+	var redirectUrl : String;
+	/**
+		Only used as a response to the onBeforeRequest event. If set, the original request is prevented from being
+		sent/completed and is instead upgraded to a secure request.  If any extension returns <code>redirectUrl</code>
+		during onBeforeRequest, <code>upgradeToSecure</code> will have no affect.
+		Optional.
+	**/
+	@:optional
+	var upgradeToSecure : Bool;
+	/**
+		Only used as a response to the onBeforeSendHeaders event. If set, the request is made with these request headers instead.
+		Optional.
+	**/
+	@:optional
+	var requestHeaders : HttpHeaders;
+	/**
+		Only used as a response to the onHeadersReceived event. If set, the server is assumed to have responded with these
+		response headers instead. Only return <code>responseHeaders</code> if you really want to modify the headers in order to
+		limit the number of conflicts (only one extension may modify <code>responseHeaders</code> for each request).
+		Optional.
+	**/
+	@:optional
+	var responseHeaders : HttpHeaders;
+	/**
+		Only used as a response to the onAuthRequired event. If set, the request is made using the supplied credentials.
+		Optional.
+	**/
+	@:optional
+	var authCredentials : BlockingResponseAuthCredentialsType;
+};