Class/struct layout optimization for blink Resource related classes

third_party/WebKit/public/platform/WebCachePolicy.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WebCachePolicy_h
 #define WebCachePolicy_h
 
 namespace blink {
 
-enum class WebCachePolicy {
+enum class WebCachePolicy : uint8_t {
   kUseProtocolCachePolicy,   // normal load
   kValidatingCacheData,      // reload
   kBypassingCache,           // end-to-end reload
   kReturnCacheDataElseLoad,  // back/forward or encoding change - allow stale
                              // data
   kReturnCacheDataDontLoad,  // results of a post - allow stale data and only
                              // use cache
-  kReturnCacheDataIfValid,  // for cache-aware loading - disallow stale data
+  kReturnCacheDataIfValid,   // for cache-aware loading - disallow stale data
   kBypassCacheLoadOnlyFromCache,  // for cache-only load when disable cache
                                   // is enabled. Results in a network error.
 };
 
 }  // namespace blink
 
 #endif  // WebCachePolicy_h