Add link preload as=document support

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 a43f60754a60f58a79bbd1ccf70706b6f0bdfd83..3de01cfc32dc938b05ef439114c591adc03d7838 100644
--- a/third_party/WebKit/Source/platform/network/ResourceRequest.h
+++ b/third_party/WebKit/Source/platform/network/ResourceRequest.h
@@ -237,6 +237,9 @@ public:
     void setRedirectStatus(RedirectStatus status) { m_redirectStatus = status; }
     RedirectStatus redirectStatus() const { return m_redirectStatus; }
 
+    void setLinkPreload(bool isLinkPreload) { m_isLinkPreload = isLinkPreload; }
+    bool linkPreload() const { return m_isLinkPreload; }
+
 private:
     void initialize(const KURL&);
 
@@ -258,6 +261,7 @@ private:
     bool m_downloadToFile : 1;
     bool m_useStreamOnResponse : 1;
     bool m_shouldResetAppCache : 1;
+    bool m_isLinkPreload : 1;
     WebURLRequest::SkipServiceWorker m_skipServiceWorker;
     ResourceLoadPriority m_priority;
     int m_intraPriorityValue;
@@ -307,6 +311,7 @@ public:
     WebURLRequest::SkipServiceWorker m_skipServiceWorker;
     bool m_useStreamOnResponse;
     bool m_shouldResetAppCache;
+    bool m_isLinkPreload;
     ResourceLoadPriority m_priority;
     int m_intraPriorityValue;
     int m_requestorID;