SDCH: add TimeWeightedMemoryUse

net/sdch/sdch_owner.h

Index: net/sdch/sdch_owner.h
diff --git a/net/sdch/sdch_owner.h b/net/sdch/sdch_owner.h
index 1655275d67a3e8365dc61cf8b01268a5e2884906..8099cd726ba049f550e52179ef9c4fa3ca803b38 100644
--- a/net/sdch/sdch_owner.h
+++ b/net/sdch/sdch_owner.h
@@ -116,6 +116,52 @@ class NET_EXPORT SdchOwner : public net::SdchObserver,
 
   bool IsPersistingDictionaries() const;
 
+  enum DictionaryFate {
+    // A Get-Dictionary header wasn't acted on.
+    DICTIONARY_FATE_GET_IGNORED = 1,
+
+    // A fetch was attempted, but failed.
+    // TODO(rdsmith): Actually record this case.
+    DICTIONARY_FATE_FETCH_FAILED = 2,
+
+    // A successful fetch was dropped on the floor, no space.
+    DICTIONARY_FATE_FETCH_IGNORED_NO_SPACE = 3,
+
+    // A successful fetch was refused by the SdchManager.
+    DICTIONARY_FATE_FETCH_MANAGER_REFUSED = 4,
+
+    // A dictionary was successfully added based on
+    // a Get-Dictionary header in a response.
+    DICTIONARY_FATE_ADD_RESPONSE_TRIGGERED = 5,
+
+    // A dictionary was evicted by an incoming dict.
+    DICTIONARY_FATE_EVICT_FOR_DICT = 6,
+
+    // A dictionary was evicted by memory pressure.
+    DICTIONARY_FATE_EVICT_FOR_MEMORY = 7,
+
+    // A dictionary was evicted on destruction.
+    DICTIONARY_FATE_EVICT_FOR_DESTRUCTION = 8,
+
+    // A dictionary was successfully added based on
+    // persistence from a previous browser revision.
+    DICTIONARY_FATE_ADD_PERSISTENCE_TRIGGERED = 9,
+
+    // A dictionary was unloaded on destruction, but is still present on disk.
+    DICTIONARY_FATE_UNLOAD_FOR_DESTRUCTION = 10,
+
+    DICTIONARY_FATE_MAX = 11
+  };
+
+  void RecordDictionaryFate(DictionaryFate fate);
+
+  // Record the lifetime memory use of a specified dictionary, identified by
+  // server hash.
+  void RecordDictionaryEvictionOrUnload(
+      const std::string& server_hash,
+      size_t size,
+      int use_count, DictionaryFate fate);
+
   // For investigation of http://crbug.com/454198; remove when resolved.
   base::WeakPtr<net::SdchManager> manager_;
   scoped_ptr<net::SdchDictionaryFetcher> fetcher_;
@@ -158,6 +204,14 @@ class NET_EXPORT SdchOwner : public net::SdchObserver,
   // load.
   std::map<std::string, int> use_counts_at_load_;
 
+  // Load times for loaded dictionaries, keyed by server hash. These are used to
+  // track the durations that dictionaries are in memory.
+  std::map<std::string, base::Time> load_times_;
+
+  // Byte-seconds consumed by dictionaries that have been unloaded. These are
+  // stored for later uploading in the SdchOwner destructor.
+  std::vector<int64> consumed_byte_seconds_;
+
   DISALLOW_COPY_AND_ASSIGN(SdchOwner);
 };