Class/struct layout optimization for blink Resource related classes

third_party/WebKit/Source/platform/weborigin/ReferrerPolicy.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 16 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */
 
 #ifndef ReferrerPolicy_h
 #define ReferrerPolicy_h
 
 namespace blink {
 
-enum ReferrerPolicy {
+enum ReferrerPolicy : uint8_t {
   // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-unsafe-url
   kReferrerPolicyAlways,
   // The default policy, if no policy is explicitly set by the page.
   kReferrerPolicyDefault,
   // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-no-referrer-when-downgrade
   kReferrerPolicyNoReferrerWhenDowngrade,
   // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-no-referrer
   kReferrerPolicyNever,
   // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-origin
   kReferrerPolicyOrigin,
   // https://w3c.github.io/webappsec/specs/referrer-policy/#referrer-policy-state-origin-when-cross-origin
   kReferrerPolicyOriginWhenCrossOrigin,
   // https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-strict-origin-when-cross-origin
   // Also used as the default policy when reduced-referrer-grnaularity is
   // enabled (not spec conformant).
   // TODO(estark): rename to kReferrerPolicyStrictOriginWhenCrossOrigin to
   // match spec.
   kReferrerPolicyNoReferrerWhenDowngradeOriginWhenCrossOrigin,
   // https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-same-origin
   kReferrerPolicySameOrigin,
   // https://w3c.github.io/webappsec-referrer-policy/#referrer-policy-strict-origin
   kReferrerPolicyStrictOrigin,
 };
 
 }  // namespace blink
 
 #endif  // ReferrerPolicy_h