DevTools: expose linkPreload bit on the network request.

third_party/WebKit/Source/platform/network/ResourceRequest.h

 /*
  * Copyright (C) 2003, 2006 Apple Computer, Inc.  All rights reserved.
  * Copyright (C) 2006 Samuel Weinig <sam.weinig@gmail.com>
  * Copyright (C) 2009, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 298 matching lines @@
   RedirectStatus redirectStatus() const { return m_redirectStatus; }
 
   void setNavigationStartTime(double);
   double navigationStartTime() const { return m_navigationStart; }
 
   void setIsSameDocumentNavigation(bool isSameDocument) {
     m_isSameDocumentNavigation = isSameDocument;
   }
   bool isSameDocumentNavigation() const { return m_isSameDocumentNavigation; }
 
+  // TODO(toyoshim): If it is reasonable, we try merging m_speculativePreload
+  // and m_linkPreload into one enum type. See https://crbug.com/675883.
+  bool isLinkPreload() const { return m_linkPreload; }

[Nate Chapin, 2017/03/16 17:15:00]

The standard I typically use for deciding whether something should go on
ResourceRequest versus FetchRequest is: does it need to be handled outside of
blink?

I'm not aware of any plans to expose these bits to content/, so I'd be inclined
to leave them on FetchRequest and do the extra plumbing. If there are such plans
and I'm oblivious, then this is fine :)

+  void setLinkPreload(bool isLinkPreload) { m_linkPreload = isLinkPreload; }
+
+  bool isSpeculativePreload() const { return m_speculativePreload; }
+  void setSpeculativePreload(bool speculativePreload, double discoveryTime = 0);
+
+  double preloadDiscoveryTime() const { return m_preloadDiscoveryTime; }
+
  private:
   const CacheControlHeader& cacheControlHeader() const;
 
   bool needsHTTPOrigin() const;
 
   KURL m_url;
   WebCachePolicy m_cachePolicy;
   double m_timeoutInterval;  // 0 is a magic value for platform default on
                              // platforms that have one.
   KURL m_firstPartyForCookies;
@@ skipping 21 matching lines @@
   WebURLRequest::FetchRequestMode m_fetchRequestMode;
   WebURLRequest::FetchCredentialsMode m_fetchCredentialsMode;
   WebURLRequest::FetchRedirectMode m_fetchRedirectMode;
   WebURLRequest::PreviewsState m_previewsState;
   ReferrerPolicy m_referrerPolicy;
   bool m_didSetHTTPReferrer;
   bool m_checkForBrowserSideNavigation;
   double m_uiStartTime;
   bool m_isExternalRequest;
   bool m_isSameDocumentNavigation;
+  bool m_linkPreload;
+  bool m_speculativePreload;
+  double m_preloadDiscoveryTime;
+
   InputToLoadPerfMetricReportPolicy m_inputPerfMetricReportPolicy;
 
   mutable CacheControlHeader m_cacheControlHeaderCache;
 
   static double s_defaultTimeoutInterval;
 
   RedirectStatus m_redirectStatus;
 
   double m_navigationStart = 0;
 };
@@ skipping 38 matching lines @@
   bool m_checkForBrowserSideNavigation;
   double m_uiStartTime;
   bool m_isExternalRequest;
   InputToLoadPerfMetricReportPolicy m_inputPerfMetricReportPolicy;
   ResourceRequest::RedirectStatus m_redirectStatus;
 };
 
 }  // namespace blink
 
 #endif  // ResourceRequest_h