The user Agent reported by the Chromium 44 embedded in the APK is: 

"Mozilla/5.0 (Linux; Android 4.4.3; TC700H Build/01-23257-K-18-03-00-MV) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.157 Crosswalk/15.44.384.13 Mobile Safari/537.36"

Could you open up DevTools on DevTools? Once you've done the usual remote debugging steps, you can open up a DevTools inspecting the DevTools front-end by undocking DevTools and then doing (ctrl/cmd+shift+i). Once you do this, could you report any console / network errors that you see? Also, what version of Chrome were you using before (62?)?

We try to be careful and preserve backwards compatibility but it's possible 63 removed a Chrome/Blink API that we used to rely on in historical DevTools front-ends.

It was working up to version 62. I also attached a file showing how the devtools look like when trying to connect to a Remote chromium 44.

I cleared the dev-tool cache and tried a location.reload(). No network errors but this console messages: 

========================================================================
[Deprecation] Use of the Application Cache is deprecated on insecure origins. Support will be removed in the future. You should consider switching your application to a secure origin, such as HTTPS. See https://goo.gl/rStTGz for more details.
inspector.html:1 Creating Application Cache with manifest chrome-devtools://devtools/remote/serve_rev/@200670/200670.manifest
inspector.html:1 Application Cache Checking event
inspector.html:1 Application Cache Downloading event
inspector.html:1 Application Cache Progress event (0 of 103) chrome-devtools://devtools/remote/serve_rev/@200670/Images/chromeRight.png
inspector.html:1 Application Cache Progress event (1 of 103) chrome-devtools://devtools/remote/serve_rev/@200670/Images/errorWave.png
[Deprecation] /deep/ combinator is no longer supported in CSS dynamic profile.It is now effectively no-op, acting as if it were a descendant combinator. /deep/ combinator will be removed, and will be invalid at M65. You should remove it. See https://www.chromestatus.com/features/4964279606312960 for more details.
inspector.html:1 Application Cache Progress event (2 of 103) chrome-devtools://devtools/remote/serve_rev/@200670/layers_module.js
inspector.html:1 Application Cache Progress event (3 of 103) chrome-devtools://devtools/remote/serve_rev/@200670/Images/toolbarButtonGlyphs.png
inspector.html:1 
.....
Application Cache Progress event (103 of 103) 
inspector.html:1 Application Cache Cached event

I will try playing with the '--disable-blink-features=DeepCombinatorInCSSDynamicProfile' and/or
'--disable-blink-features=ShadowPseudoElementInCSSDynamicProfile' switches if this makes a difference.

Deleted: devrools.PNG 130 KB

	devrools.PNG 130 KB View Download

Update: it is the "DeepCombinator" issue. 

Running chrome with 

.\chrome.exe --enable-blink-features=DeepCombinatorInCSSDynamicProfile

completely restore the functionality to the devtools. 

I will report on the other thread of this behavior. 

@prinex - thanks for following up. Unfortunately, there isn't a lot our team can do since Blink (the rendering engine) has deprecated and will remove the deep selector. There's a range of historical front-ends where we used this prior to its deprecation and it looks like they will be broken on any up-to-date Chrome.

It's very risky for us to change these historical front-ends and swap out usage of the deep API, so the only solution / hack I can think of is to use an older Chromium build, as these don't automatically upgrade like normal Chrome builds. You can find steps for this: https://www.chromium.org/getting-involved/download-chromium

@pfeldman - is there any workaround that you can think of?

 Issue 803213  has been merged into this issue.