DevTools: expose linkPreload bit on the network request.

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

Index: third_party/WebKit/Source/platform/network/ResourceRequest.h
diff --git a/third_party/WebKit/Source/platform/network/ResourceRequest.h b/third_party/WebKit/Source/platform/network/ResourceRequest.h
index 8c1f927c86c72204d65780288e5e13f49cfbe8c1..481f552eb00d2c8bb6f7379e0efd36ecb4e198fc 100644
--- a/third_party/WebKit/Source/platform/network/ResourceRequest.h
+++ b/third_party/WebKit/Source/platform/network/ResourceRequest.h
@@ -316,6 +316,16 @@ class PLATFORM_EXPORT ResourceRequest final {
   }
   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;
 
@@ -357,6 +367,10 @@ class PLATFORM_EXPORT ResourceRequest final {
   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;