RFC: use some in-memory state in SimpleCache to quickly cache-miss some CantConditionalize cases

net/http/http_cache.cc

Index: net/http/http_cache.cc
diff --git a/net/http/http_cache.cc b/net/http/http_cache.cc
index 68aee907e43674a7f207f496fa7ac2df8f8ccce9..5d7d2dc5cf27ff0c7ca0e7164e655307ff363a84 100644
--- a/net/http/http_cache.cc
+++ b/net/http/http_cache.cc
@@ -739,7 +739,8 @@ void HttpCache::DeletePendingOp(PendingOp* pending_op) {
   delete pending_op;
 }
 
-int HttpCache::OpenEntry(const std::string& key, ActiveEntry** entry,
+int HttpCache::OpenEntry(const std::string& key,
+                         ActiveEntry** entry,
                          Transaction* trans) {
   ActiveEntry* active_entry = FindActiveEntry(key);
   if (active_entry) {
@@ -747,6 +748,12 @@ int HttpCache::OpenEntry(const std::string& key, ActiveEntry** entry,
     return OK;
   }
 
+  // See if we could potentially quick-reject the entry.
+  uint8_t in_memory_info = disk_cache_->GetMemoryEntryData(key);
+  if (trans->MaybeRejectBasedOnMemoryEntryData(in_memory_info)) {
+    return net::OK;  // ERR_FAILED;
+  }
+
   std::unique_ptr<WorkItem> item =
       base::MakeUnique<WorkItem>(WI_OPEN_ENTRY, trans, entry);
   PendingOp* pending_op = GetPendingOp(key);