@Override
    public void onServiceConnected(CustomTabsClient client) {
        mClient = client;
        mClient.warmup(0L);
        if (mConnectionCallback != null) mConnectionCallback.onCustomTabsConnected();
    }
@see {@link CustomTabsSession#mayLaunchUrl(Uri, Bundle, List)}.
@return true if call to mayLaunchUrl was accepted.
demos/src/main/java/org/chromium/customtabsdemos/CustomTabActivityHelper.java