private CustomTabsSession getSession() {
        if (mClient == null) {
            mCustomTabsSession = null;
        } else if (mCustomTabsSession == null) {
            mCustomTabsSession = mClient.newSession(new NavigationCallback());
            SessionHelper.setCurrentSession(mCustomTabsSession);
        }
        return mCustomTabsSession;
    }
Once per second, asks the framework for the process importance, and logs any change.
Application/src/main/java/org/chromium/customtabsclient/MainActivity.java