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

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..b82df5df5f5e3b44d811481e5cc5f75ccf6d44ff 100644
--- a/net/http/mock_http_cache.h
+++ b/net/http/mock_http_cache.h
@@ -37,6 +37,8 @@ class MockDiskEntry : public disk_cache::Entry,
   base::Time GetLastUsed() const override;
   base::Time GetLastModified() const override;
   int32_t GetDataSize(int index) const override;
+  uint8_t GetOracleByte() const { return oracle_byte_; }
+  void SetOracleByte(uint8_t val) override;
   int ReadData(int index,
                int offset,
                IOBuffer* buf,
@@ -98,6 +100,7 @@ class MockDiskEntry : public disk_cache::Entry,
 
   std::string key_;
   std::vector<char> data_[kNumCacheEntryDataIndices];
+  unsigned char oracle_byte_;
   int test_mode_;
   bool doomed_;
   bool sparse_;
@@ -119,6 +122,10 @@ class MockDiskCache : public disk_cache::Backend {
   int OpenEntry(const std::string& key,
                 disk_cache::Entry** entry,
                 const CompletionCallback& callback) override;
+  int OpenEntryWithOracleByte(const std::string& key,
+                              disk_cache::Entry** entry,
+                              const OracleCallback& oracle,
+                              const CompletionCallback& callback) override;
   int CreateEntry(const std::string& key,
                   disk_cache::Entry** entry,
                   const CompletionCallback& callback) override;