Merge "WebView: document when shouldOverrideUrlLoading happens" into main

     * {@code true} causes the current WebView to abort loading the URL, while returning

     * {@code false} causes the WebView to continue loading the URL as usual.

     *

     * <p>This callback is not called for all page navigations. In particular, this is not called

     * for navigations which the app initiated with {@code loadUrl()}: this callback would not serve

     * a purpose in this case, because the app already knows about the navigation. This callback

     * lets the app know about navigations initiated by the web page (such as navigations initiated

     * by JavaScript code), by the user (such as when the user taps on a link), or by an HTTP

     * redirect (ex. if {@code loadUrl("foo.com")} redirects to {@code "bar.com"} because of HTTP

     * 301).

     *

     * <p class="note"><b>Note:</b> Do not call {@link WebView#loadUrl(String)} with the request's

     * URL and then return {@code true}. This unnecessarily cancels the current load and starts a

     * new load with the same URL. The correct way to continue loading a given URL is to simply