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

net/disk_cache/simple/simple_backend_impl.cc

Index: net/disk_cache/simple/simple_backend_impl.cc
diff --git a/net/disk_cache/simple/simple_backend_impl.cc b/net/disk_cache/simple/simple_backend_impl.cc
index 88d2741e9797f8452efeea09fa1bbd376ed9354b..5efc44ab19d11b6b6838a5a93cf6e3968a174c1b 100644
--- a/net/disk_cache/simple/simple_backend_impl.cc
+++ b/net/disk_cache/simple/simple_backend_impl.cc
@@ -576,6 +576,17 @@ size_t SimpleBackendImpl::DumpMemoryStats(
   return size;
 }
 
+uint8_t SimpleBackendImpl::GetMemoryEntryData(const std::string& key) {
+  const uint64_t entry_hash = simple_util::GetEntryHashKey(key);
+  return index_->GetMemoryEntryData(entry_hash);
+}
+
+void SimpleBackendImpl::SetMemoryEntryData(const std::string& key,
+                                           uint8_t data) {
+  const uint64_t entry_hash = simple_util::GetEntryHashKey(key);
+  index_->SetMemoryEntryData(entry_hash, data);
+}
+
 void SimpleBackendImpl::InitializeIndex(const CompletionCallback& callback,
                                         const DiskStatResult& result) {
   if (result.net_error == net::OK) {