Exposing CacheEntryStatus (former TransactionPattern) via UrlRequest

net/http/http_cache_transaction.h

Index: net/http/http_cache_transaction.h
diff --git a/net/http/http_cache_transaction.h b/net/http/http_cache_transaction.h
index 6ad51ab9080d903522df5ad3becf1cd0ea457fc0..b142c0adc63aa273ab3ac50b5b8fb7d26078c70d 100644
--- a/net/http/http_cache_transaction.h
+++ b/net/http/http_cache_transaction.h
@@ -229,23 +229,6 @@ class HttpCache::Transaction : public HttpTransaction {
     STATE_CACHE_WRITE_TRUNCATED_RESPONSE_COMPLETE
   };
 
-  // Used for categorizing transactions for reporting in histograms. Patterns
-  // cover relatively common use cases being measured and considered for
-  // optimization. Many use cases that are more complex or uncommon are binned
-  // as PATTERN_NOT_COVERED, and details are not reported.
-  // NOTE: This enumeration is used in histograms, so please do not add entries
-  // in the middle.
-  enum TransactionPattern {
-    PATTERN_UNDEFINED,
-    PATTERN_NOT_COVERED,
-    PATTERN_ENTRY_NOT_CACHED,
-    PATTERN_ENTRY_USED,
-    PATTERN_ENTRY_VALIDATED,
-    PATTERN_ENTRY_UPDATED,
-    PATTERN_ENTRY_CANT_CONDITIONALIZE,
-    PATTERN_MAX,
-  };
-
   // Used for categorizing validation triggers in histograms.
   // NOTE: This enumeration is used in histograms, so please do not add entries
   // in the middle.
@@ -432,7 +415,14 @@ class HttpCache::Transaction : public HttpTransaction {
   // data is considered for the result.
   bool CanResume(bool has_data);
 
-  void UpdateTransactionPattern(TransactionPattern new_transaction_pattern);
+  // Setter for response_.
+  void set_response(const HttpResponseInfo& new_response);
+
+  void UpdateCacheEntryStatus(
+      HttpResponseInfo::CacheEntryStatus new_cache_entry_status);
+
+  // Sets the response.cache_entry_status to the current cache_entry_status_.
+  void SyncCacheEntryStatusToResponse();
   void RecordHistograms();
 
   // Called to signal completion of asynchronous IO.
@@ -479,7 +469,11 @@ class HttpCache::Transaction : public HttpTransaction {
   CompletionCallback io_callback_;
 
   // Members used to track data for histograms.
-  TransactionPattern transaction_pattern_;
+  // This cache_entry_status_ takes precedence over
+  // response_.cache_entry_status. In fact, response_.cache_entry_status must be
+  // kept in sync with cache_entry_status_ (via set_response and
+  // UpdateCacheEntryStatus).
+  HttpResponseInfo::CacheEntryStatus cache_entry_status_;
   ValidationCause validation_cause_;
   base::TimeTicks entry_lock_waiting_since_;
   base::TimeTicks first_cache_access_since_;