Cleaning up fonts when viewer is idle for some time

src/core/pdf_manager.js

@@ -46,6 +46,10 @@ var BasePdfManager = (function BasePdfManagerClosure() {
       return this.pdfModel.getPage(pageIndex);
     },
 
+    cleanup: function BasePdfManager_cleanup() {
+      return this.pdfModel.cleanup();
+    },
+
     ensure: function BasePdfManager_ensure(obj, prop, args) {
       return new NotImplementedException();
     },