Add "registerable domain" support to OriginAccessEntry.

Source/platform/weborigin/OriginAccessEntry.h

Index: Source/platform/weborigin/OriginAccessEntry.h
diff --git a/Source/platform/weborigin/OriginAccessEntry.h b/Source/platform/weborigin/OriginAccessEntry.h
index 0147a1a2bb9614a4bafef2f129fcc485e49d3785..42a7827d737c4fbf4fac2b31a39fd857e0e5adc7 100644
--- a/Source/platform/weborigin/OriginAccessEntry.h
+++ b/Source/platform/weborigin/OriginAccessEntry.h
@@ -41,7 +41,13 @@ class SecurityOrigin;
 class PLATFORM_EXPORT OriginAccessEntry {
 public:
     enum SubdomainSetting {
+        // 'www.example.com' matches an OriginAccessEntry for 'example.com'
         AllowSubdomains,
+
+        // 'www.example.com' matches an OriginAccessEntry for 'not-www.example.com'
+        AllowRegisterableDomains,
+
+        // 'www.example.com' does not match an OriginAccessEntry for 'example.com'
         DisallowSubdomains
     };
 
@@ -51,7 +57,7 @@ public:
         DoesNotMatchOrigin
     };
 
-    // If host is empty string and SubdomainSetting is AllowSubdomains, the entry will match all domains in the specified protocol.
+    // If host is empty string and SubdomainSetting is not DisallowSubdomains, the entry will match all domains in the specified protocol.
     // IPv6 addresses must include brackets (e.g. '[2001:db8:85a3::8a2e:370:7334]', not '2001:db8:85a3::8a2e:370:7334').
     OriginAccessEntry(const String& protocol, const String& host, SubdomainSetting);
     MatchResult matchesOrigin(const SecurityOrigin&) const;
@@ -60,10 +66,12 @@ public:
     const String& host() const { return m_host; }
     SubdomainSetting subdomainSettings() const { return m_subdomainSettings; }
     bool hostIsIPAddress() const { return m_hostIsIPAddress; }
+    const String& registerable() const { return m_registerableDomain; }
 
 private:
     String m_protocol;
     String m_host;
+    String m_registerableDomain;
     SubdomainSetting m_subdomainSettings;
     bool m_hostIsIPAddress;
     bool m_hostIsPublicSuffix;