@NonNull
    public TrustedWebActivityIntentBuilder setNavigationBarColor(@ColorInt int color) {
        mIntentBuilder.setNavigationBarColor(color);
        return this;
    }
Sets the navigation bar color, see {@link CustomTabsIntent.Builder#setNavigationBarColor}.
customtabs/src/android/support/customtabs/trusted/TrustedWebActivityIntentBuilder.java