WebURLRequest: Track the requesting document's URL through navigations.

Source/platform/network/ResourceRequest.h

Index: Source/platform/network/ResourceRequest.h
diff --git a/Source/platform/network/ResourceRequest.h b/Source/platform/network/ResourceRequest.h
index 7a1dbf189cda95b8ea7e748d82dfbc60d5a2260f..8023118792cdc72563dc2d413abc6b7e80854767 100644
--- a/Source/platform/network/ResourceRequest.h
+++ b/Source/platform/network/ResourceRequest.h
@@ -34,6 +34,7 @@
 #include "platform/network/ResourceLoadPriority.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/Referrer.h"
+#include "platform/weborigin/SecurityOrigin.h"
 #include "public/platform/WebURLRequest.h"
 #include "wtf/OwnPtr.h"
 
@@ -100,6 +101,9 @@ public:
     const KURL& firstPartyForCookies() const;
     void setFirstPartyForCookies(const KURL& firstPartyForCookies);
 
+    PassRefPtr<SecurityOrigin> requestorOrigin() const;
+    void setRequestorOrigin(PassRefPtr<SecurityOrigin>);
+
     const AtomicString& httpMethod() const;
     void setHTTPMethod(const AtomicString&);
 
@@ -240,6 +244,7 @@ private:
     ResourceRequestCachePolicy m_cachePolicy;
     double m_timeoutInterval; // 0 is a magic value for platform default on platforms that have one.
     KURL m_firstPartyForCookies;
+    RefPtr<SecurityOrigin> m_requestorOrigin;
     AtomicString m_httpMethod;
     HTTPHeaderMap m_httpHeaderFields;
     RefPtr<FormData> m_httpBody;
@@ -289,6 +294,7 @@ public:
     ResourceRequestCachePolicy m_cachePolicy;
     double m_timeoutInterval;
     KURL m_firstPartyForCookies;
+    RefPtr<SecurityOrigin> m_requestorOrigin;
 
     String m_httpMethod;
     OwnPtr<CrossThreadHTTPHeaderMapData> m_httpHeaders;