src/vs/workbench/api/common/extHostLanguageFeatures.ts/ExtHostLanguageFeatures/$provideCompletionItems
class ExtHostLanguageFeatures:	$provideCompletionItems(handle: number, resource: UriComponents, position: IPosition, context: modes.CompletionContext, token: CancellationToken): Promise<extHostProtocol.ISuggestResultDto | undefined> {
		return this._withAdapter(handle, SuggestAdapter, adapter => adapter.provideCompletionItems(URI.revive(resource), position, context, token), undefined);
	}