Support 'First-Party-Only' cookies in devtools.

Source/devtools/front_end/sdk/CookieParser.js

Index: Source/devtools/front_end/sdk/CookieParser.js
diff --git a/Source/devtools/front_end/sdk/CookieParser.js b/Source/devtools/front_end/sdk/CookieParser.js
index cbc71b54249ce531f273430d66337b031281dd4f..01c4d5822c850a7764df1a5483cd747421359c6a 100644
--- a/Source/devtools/front_end/sdk/CookieParser.js
+++ b/Source/devtools/front_end/sdk/CookieParser.js
@@ -260,6 +260,14 @@ WebInspector.Cookie.prototype = {
     /**
      * @return {boolean}
      */
+    firstPartyOnly: function ()
+    {
+        return "first-party-only" in this._attributes;
+    },
+
+    /**
+     * @return {boolean}
+     */
     session: function()
     {
         // RFC 2965 suggests using Discard attribute to mark session cookies, but this does not seem to be widely used.
@@ -420,6 +428,8 @@ WebInspector.Cookies._parseProtocolCookie = function(target, protocolCookie)
         cookie.addAttribute("httpOnly");
     if (protocolCookie["secure"])
         cookie.addAttribute("secure");
+    if (protocolCookie["firstPartyOnly"])
+        cookie.addAttribute("first-party-only");
     cookie.setSize(protocolCookie["size"]);
     return cookie;
 }