HttpCache::Transaction layer allowing parallel validation

net/http/mock_http_cache.h

Index: net/http/mock_http_cache.h
diff --git a/net/http/mock_http_cache.h b/net/http/mock_http_cache.h
index a24200bf8348cd2ea0ed018a54c7832386195bad..7718f35116974bb17bda26854341e77f7b93ba5f 100644
--- a/net/http/mock_http_cache.h
+++ b/net/http/mock_http_cache.h
@@ -158,6 +158,8 @@ class MockDiskCache : public disk_cache::Backend {
 
   void ReleaseAll();
 
+  bool IsDiskEntryDoomed(const std::string& key);
+
  private:
   using EntryMap = std::unordered_map<std::string, MockDiskEntry*>;
   class NotImplementedIterator;
@@ -234,6 +236,14 @@ class MockHttpCache {
   // the test! (by setting test_mode to zero).
   static void SetTestMode(int test_mode);
 
+  // Functions to test the state of ActiveEntry.
+
+  bool IsWriterPresent(const std::string& key);
+  bool IsHeadersTransactionPresent(const std::string& key);
+  int GetCountReaders(const std::string& key);
+  int GetCountAddToEntryQueue(const std::string& key);
+  int GetCountDoneHeadersQueue(const std::string& key);
+
  private:
   HttpCache http_cache_;
 };