Adds a feature to MHTML serialization that omits subframes and subresources marked no-store.

third_party/WebKit/public/web/WebFrameSerializerCacheControlPolicy.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 WebFrameSerializerCacheControlPolicy_h
 #define WebFrameSerializerCacheControlPolicy_h
 
 namespace blink {
 
 // WebFrameSerializerCacheControlPolicy configures how WebFrameSerializer
 // processes resources with different Cache-Control headers. By default, frame
 // serialization encompasses all resources in a page.  If it is desirable to
 // serialize only those resources that could be stored by a http cache, the
 // other options may be used.
 // TODO(dewittj): Add more policies for subframes and subresources.
 enum class WebFrameSerializerCacheControlPolicy {
     None = 0,
     FailForNoStoreMainFrame,
-    Last = FailForNoStoreMainFrame,
+    SkipAnyFrameOrResourceMarkedNoStore,
+    Last = SkipAnyFrameOrResourceMarkedNoStore,
 };
 
 } // namespace blink
 
 #endif // WebFrameSerializerCacheControlPolicy_h