src/vs/editor/browser/services/editorWorkerService.ts/EditorModelManager/ensureSyncedResources
class EditorModelManager:	public ensureSyncedResources(resources: URI[], forceLargeModels: boolean): void {
		for (const resource of resources) {
			const resourceStr = resource.toString();

			if (!this._syncedModels[resourceStr]) {
				this._beginModelSync(resource, forceLargeModels);
			}
			if (this._syncedModels[resourceStr]) {
				this._syncedModelsLastUsedTime[resourceStr] = (new Date()).getTime();
			}
		}
	}