This folder holds the native entrypoint for all WebView processes, and is
responsible for delegating to //android_webview/browser/
,
//android_webview/renderer/
, etc.. implementations depending on what process
is being started.
//android_webview/lib/
is analogous to the app
folder in other content
embedders. As such, it is the only path allowed to depend on native code from
all processes (e.g. both //android_webview/browser/
and
//android_webview/renderer/
).