Create SharedSQLiteCache

include/mbgl/android/native_map_view.hpp

@@ -90,7 +90,7 @@ private:
     size_t totalMemory = 0;
 
     // Ensure these are initialised last
-    mbgl::SQLiteCache fileCache;
+    std::shared_ptr<mbgl::SQLiteCache> fileCache;
     mbgl::DefaultFileSource fileSource;
     mbgl::Map map;
 

include/mbgl/storage/sqlite_cache.hpp

@@ -26,6 +26,16 @@ private:
     const std::unique_ptr<util::Thread<Impl>> thread;
 };
 
+class SharedSQLiteCache : util::noncopyable {
+public:
+    static std::shared_ptr<SQLiteCache> get(const std::string &path = ":memory:");
+
+private:
+    SharedSQLiteCache() {}
+
+    static std::weak_ptr<SQLiteCache> masterPtr;
+};
+
 }
 
 #endif