Selectively remove/disable syncing Google Drive documents on Chrome

Question

I have installed the Google Docs app (extension) on Google Chrome (v43.0.2357.65 (Official Build) beta (64-bit) on Ubuntu Linux 14.04), and enabled offline sync on my Google Drive account. Offline editing and sync for Docs works fine, but I cannot find a way to remove a synced document from my local Chrome app (for example, I would like to remove from the Docs app, documents that I have finished working with). Is there a way to remove such an already synced document from the local Docs app on Chrome?

Also, is there a way to prevent certain documents from being automatically synced in this way? (e.g. disabling sync for a selected doc on the Chrome app or the Google Drive interface)

Note: I'm not referring to the Drive desktop app, but to the Docs app available via Chrome Web Store.

Answer 1

Short Answer

No, there isn't.

Long Answer

The Google Docs app available via the Chrome Web Store actually works as a shortcut or bookmark to the web app.

The Google Docs offline capability, is actually a feature of the Google Drive web app. It requires Chrome to work, but not the Google Docs Chrome extension.

There isn't a way to select with files or folders will be synced.

References
Access your files offline - Drive Help

Answer 2

Found an imperfect workaround.

Seems that Chrome stores its offline sync data under IndexedDB. Visiting a docs.google.com domain (e.g. an offline synced document) and clearing (truncating) a couple of tables under Developer Console > Resources > IndexedDB > GoogleDocs (using the Clear object store at the bottom) seemed to do the trick.

The following were the tables I cleared: DocumentCommands, DocumentLocks, Documents, Comments, FileEntities, PendingQueues, Impressions, and DocumentEntities. It may be possible to get things done by clearing a lesser number of tables, though.

WARNING: Truncation of tables clears all currently synced documents. However, it should be possible (programmatically or otherwise) to remove a selected set of documents by removing only the relevant entities from IndexedDB (using their document IDs, maybe).

By the way, this was on Google Chrome 48.0.2564.79 beta (64-bit) on Linux (Ubuntu).