Added field to error structures to signal existence of a stale copy in

Source/platform/network/ResourceError.cpp

Index: Source/platform/network/ResourceError.cpp
diff --git a/Source/platform/network/ResourceError.cpp b/Source/platform/network/ResourceError.cpp
index e0368db38aba2bba597721298e204983d2760bbf..5e5efc37d87b7c77ead456237f7cf6e2ca786117 100644
--- a/Source/platform/network/ResourceError.cpp
+++ b/Source/platform/network/ResourceError.cpp
@@ -51,6 +51,7 @@ ResourceError ResourceError::copy() const
     errorCopy.m_isNull = m_isNull;
     errorCopy.m_isCancellation = m_isCancellation;
     errorCopy.m_isTimeout = m_isTimeout;
+    errorCopy.m_staleCopyInCache = m_staleCopyInCache;
     return errorCopy;
 }
 
@@ -80,6 +81,9 @@ bool ResourceError::compare(const ResourceError& a, const ResourceError& b)
     if (a.isTimeout() != b.isTimeout())
         return false;
 
+    if (a.staleCopyInCache() != b.staleCopyInCache())
+        return false;
+
     return true;
 }