Don't revalidate all resources for FrameLoadTypeSame

Source/core/loader/FrameFetchContext.cpp

 /*
  * Copyright (C) 2013 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 144 matching lines @@
         return ReturnCacheDataElseLoad;
     return UseProtocolCachePolicy;
 }
 
 ResourceRequestCachePolicy FrameFetchContext::resourceRequestCachePolicy(const ResourceRequest& request, Resource::Type type) const
 {
     if (type == Resource::MainResource) {
         FrameLoadType frameLoadType = frame()->loader().loadType();
         if (request.httpMethod() == "POST" && frameLoadType == FrameLoadTypeBackForward)
             return ReturnCacheDataDontLoad;
-        if (!frame()->host()->overrideEncoding().isEmpty() || frameLoadType == FrameLoadTypeBackForward)
+        if (!frame()->host()->overrideEncoding().isEmpty())
             return ReturnCacheDataElseLoad;
-        if (frameLoadType == FrameLoadTypeReloadFromOrigin)
-            return ReloadBypassingCache;
-        if (frameLoadType == FrameLoadTypeReload || frameLoadType == FrameLoadTypeSame || request.isConditional() || request.httpMethod() == "POST")
+        if (frameLoadType == FrameLoadTypeSame || request.isConditional() || request.httpMethod() == "POST")
             return ReloadIgnoringCacheData;
-        Frame* parent = frame()->tree().parent();
-        if (parent && parent->isLocalFrame())
-            return toLocalFrame(parent)->document()->fetcher()->context().resourceRequestCachePolicy(request, type);
+
+        for (Frame* f = frame(); f; f = f->tree().parent()) {
+            if (!f->isLocalFrame())
+                continue;
+            frameLoadType = toLocalFrame(f)->loader().loadType();
+            if (frameLoadType == FrameLoadTypeBackForward)
+                return ReturnCacheDataElseLoad;
+            if (frameLoadType == FrameLoadTypeReloadFromOrigin)
+                return ReloadBypassingCache;
+            if (frameLoadType == FrameLoadTypeReload)
+                return ReloadIgnoringCacheData;
+        }
         return UseProtocolCachePolicy;
     }
 
     if (request.isConditional())
         return ReloadIgnoringCacheData;
 
     if (m_documentLoader && m_document && !m_document->loadEventFinished()) {
         // For POST requests, we mutate the main resource's cache policy to avoid form resubmission.
         // This policy should not be inherited by subresources.
         ResourceRequestCachePolicy mainResourceCachePolicy = m_documentLoader->request().cachePolicy();
@@ skipping 478 matching lines @@
 }
 
 DEFINE_TRACE(FrameFetchContext)
 {
     visitor->trace(m_document);
     visitor->trace(m_documentLoader);
     FetchContext::trace(visitor);
 }
 
 } // namespace blink