WebView does not have net-log. This is to add support in command line as a basic developer feature.
The command line version will only work in user-debug devices as there is no way to set it up in user devices.
as a future idea, one can integrate it with chrome internals UI perhaps, so that people can collect information from their browsers (just like how chrome dev tools work). This is outside the scope of this bug.
Since webview does not have a good signal to shutdown net-log, we will be ok with truncated files. Dealing with this is also outside the scope of this bug and can be done as part of the future idea above.
Comment 1 by bugdroid1@chromium.org
, Sep 20 2017