Bug 858680 - Part 3: Allow mozStorage to access the dbstats virtual table, r=asuth.

--HG--
extra : rebase_source : 250bc47337695abb09e926fb8a21e5df72724fe4

db/sqlite3/src/sqlite.def

@@ -51,6 +51,7 @@ EXPORTS
         sqlite3_create_function16
         sqlite3_create_module
         sqlite3_data_count
+        sqlite3_dbstat_register
         sqlite3_db_filename
         sqlite3_db_handle
         sqlite3_db_mutex

storage/mozStorageConnection.cpp

@@ -62,6 +62,10 @@ PRLogModuleInfo* gStorageLog = nullptr;
 #define CHECK_MAINTHREAD_ABUSE() do { /* Nothing */ } while(0)
 #endif
 
+extern "C" {
+int sqlite3_dbstat_register(sqlite3 *db);
+}
+
 namespace mozilla {
 namespace storage {
 
@@ -144,7 +148,14 @@ struct Module
 };
 
 Module gModules[] = {
-  { "filesystem", RegisterFileSystemModule }
+  { "filesystem", RegisterFileSystemModule },
+  { "dbstat",
+    [](sqlite3* aDatabase, const char* aName) -> int
+    {
+      MOZ_ASSERT(!strcmp(aName, "dbstat"));
+      return sqlite3_dbstat_register(aDatabase);
+    }
+  }
 };
 
 ////////////////////////////////////////////////////////////////////////////////