Google Chrome Devtools broken when inspecting Android Webview
As explained in Kayce Basques's answer, this is due to a problem with versions of Chrome since 63.
The solution is to use an older version of Chromium.
Here are the download links for the the latest version of Chromium (version 62.0.3202.94, branch base position 499098) which support it:
- macOS: https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Mac%2F499098%2Fchrome-mac.zip?generation=1504230238091965&alt=media
- Windows 64 bits: https://www.googleapis.com/download/storage/v1/b/chromium-browser-snapshots/o/Win_x64%2F499095%2Fchrome-win32.zip?generation=1504230103809077&alt=media
Feel free to edit this post to add the links for other platforms.
Check out: https://groups.google.com/forum/#!topic/google-chrome-developer-tools/s47cbyLKvxA
I haven't digested the thread fully, but I think it's due to a deprecation in Chrome that is outside of the DevTools team's control.
Please let us know if this is indeed the same issue that you're seeing.