WebView Log Verbosifier

WebView Log Verbosifier is an empty dummy app (in fact, it cannot be launched). However, if this app is installed, WebView will log the active field trials and CommandLine flags, for debugging/QA purposes. A dummy app is used because it can be installed on any device (including user builds, where field trials are still relevant).

Build and install

autoninja -C out/Default webview_log_verbosifier_apk
out/Default/bin/webview_log_verbosifier_apk install

Searching logcat

You can grep the logcat like so:

adb logcat | grep -i 'Active field trial' # Field trials, one per line
adb logcat | grep -i 'WebViewCommandLine' # CommandLine switches, one per line
adb logcat | grep -iE 'Active field trial|WebViewCommandLine' # Both

Then just start up any WebView app.

Uninstalling

When you're done investigating flags/field trials, you can disable the logging by uninstalling the app:

out/Default/bin/webview_log_verbosifier_apk uninstall