[Desktop][Android] Tabs not being sync'd between Android and Desktop

Description

Creating a sync chain between Desktop and Android doesn’t transfer open tabs between devices

Steps to Reproduce

1. Create a sync chain on desktop
2. Create a standalone sync chain on Android and reset it
3. Join Android to desktop sync chain using the code words from step 1
4. Ensure Sync all is enabled on both Android and Desktop
5. Verify bookmarks/history get sync’d between devices
6. Open tabs from Android is not sync’d to desktop and vice versa

Actual result:

No tabs sync on either device on the chain

Expected result:

Without any change to settings done, by default tabs should be sync’d as Sync all is enabled

Reproduces how often:

Easy

Brave version (brave://version info)

Nightly

Version/Channel Information:

• Can you reproduce this issue with the current release? NA
• Can you reproduce this issue with the beta channel? NA
• Can you reproduce this issue with the dev channel? NA
• Can you reproduce this issue with the nightly channel? Yes

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? NA
• Does the issue resolve itself when disabling Brave Rewards? NA
• Is the issue reproducible on the latest version of Chrome? NA

Miscellaneous Information:

@AlexeyBarabash mentioned once he turned on History and Opened tabs, he could see opened tabs on all devices.

[urbenlegend]

I am also hitting this issue. Most of the time, tabs are not synced from Android. The Android device does not show up at all in the Menu -> History section. In very rare occasions, the tabs will be synced and then it will stop syncing again.

Also, if I attempt to send a tab from PC to my Android device, sometimes it takes an hour for the notification to actually arrive, rendering it effectively useless.

[urbenlegend]

@jangorecki I discovered that there is a chrome://sync-internals page that shows a lot of Sync debug info.

From that page, I discovered that whenever I have sync issues on Android, the Type Info section will show a bunch of Model Types with a status of Backed Off. Under Status from Last Completed Session, it shows NETWORK_CONNECTION_UNAVAILABLE (ERR_NAME_NOT_RESOLVED). However, I am on Wi-Fi most of the time (quarantine, of course), yet this issue of Android not syncing happens quite often!

Also it took quite a while for Brave to attempt a resync after displaying those messages, even though I had the browser active with Wi-Fi connected. Perhaps Brave is waiting too long to re-attempt sync?