PlzNavigate: identify same-page browser-initiated navigation.

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

 /*
  * Copyright (C) 2003, 2006 Apple Computer, Inc.  All rights reserved.
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 57 matching lines @@
       m_frameType(WebURLRequest::FrameTypeNone),
       m_fetchRequestMode(WebURLRequest::FetchRequestModeNoCORS),
       m_fetchCredentialsMode(WebURLRequest::FetchCredentialsModeInclude),
       m_fetchRedirectMode(WebURLRequest::FetchRedirectModeFollow),
       m_previewsState(WebURLRequest::PreviewsUnspecified),
       m_referrerPolicy(ReferrerPolicyDefault),
       m_didSetHTTPReferrer(false),
       m_checkForBrowserSideNavigation(true),
       m_uiStartTime(0),
       m_isExternalRequest(false),
+      m_isSameDocumentNavigation(false),
       m_inputPerfMetricReportPolicy(
           InputToLoadPerfMetricReportPolicy::NoReport),
       m_redirectStatus(RedirectStatus::NoRedirect) {}
 
 ResourceRequest::ResourceRequest(CrossThreadResourceRequestData* data)
     : ResourceRequest(data->m_url) {
   setCachePolicy(data->m_cachePolicy);
   setTimeoutInterval(data->m_timeoutInterval);
   setFirstPartyForCookies(data->m_firstPartyForCookies);
   setRequestorOrigin(data->m_requestorOrigin);
@@ skipping 327 matching lines @@
   // layer.
   if (httpMethod() == HTTPNames::GET || httpMethod() == HTTPNames::HEAD)
     return false;
 
   // For non-GET and non-HEAD methods, always send an Origin header so the
   // server knows we support this feature.
   return true;
 }
 
 }  // namespace blink