LevelDB storage for data reduction proxy to store data usage stats.

components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h b/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
index 0ed7d1b386c3d349b91409ca857c29068d290f5c..6deb9feb6c82b8542f36ed7065f02b9026c1a901 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h
@@ -26,6 +26,8 @@ class Value;
 }
 
 namespace data_reduction_proxy {
+class DataReductionProxyStore;
+class DataUsageStorageHelper;
 
 // Data reduction proxy delayed pref service reduces the number calls to pref
 // service by storing prefs in memory and writing to the given PrefService after
@@ -41,7 +43,9 @@ class DataReductionProxyCompressionStats {
   // in the maps.
   DataReductionProxyCompressionStats(
       PrefService* pref_service,
-      scoped_refptr<base::SequencedTaskRunner> task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> db_task_runner,
+      scoped_refptr<DataReductionProxyStore> store,
       const base::TimeDelta& delay);
   ~DataReductionProxyCompressionStats();
 
@@ -84,6 +88,9 @@ class DataReductionProxyCompressionStats {
   typedef base::ScopedPtrHashMap<const char*, scoped_ptr<base::ListValue>>
       DataReductionProxyListPrefMap;
 
+  // Initializes data usage store.
+  void InitOnDBThread();
+
   // Loads all data_reduction_proxy::prefs into the |pref_map_| and
   // |list_pref_map_|.
   void Init();
@@ -138,7 +145,10 @@ class DataReductionProxyCompressionStats {
   void RecordUserVisibleDataSavings();
 
   PrefService* pref_service_;
-  scoped_refptr<base::SequencedTaskRunner> task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> db_task_runner_;
+  scoped_refptr<DataReductionProxyStore> store_;
+  scoped_ptr<DataUsageStorageHelper> data_usage_store_;
   const base::TimeDelta delay_;
   bool delayed_task_posted_;
   DataReductionProxyPrefMap pref_map_;