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 f6a805c34f550be39e332c350cc99b20ea6342d3..5ccb5e16cc7bd78144d724351f6acaabdcf788da 100644
--- a/net/http/mock_http_cache.h
+++ b/net/http/mock_http_cache.h
@@ -156,6 +156,8 @@ 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;
@@ -232,6 +234,14 @@ 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_;
 };