@NonNull
    public TrustedWebActivityIntentBuilder setColorScheme(int colorScheme) {
        mIntentBuilder.setColorScheme(colorScheme);
        return this;
    }
Sets the color scheme, see {@link CustomTabsIntent.Builder#setColorScheme}.
In Trusted Web Activities color scheme may effect such UI elements as info bars and context
menus.

@param colorScheme Must be one of {@link CustomTabsIntent#COLOR_SCHEME_SYSTEM},
{@link CustomTabsIntent#COLOR_SCHEME_LIGHT}, and {@link CustomTabsIntent#COLOR_SCHEME_DARK}.
customtabs/src/android/support/customtabs/trusted/TrustedWebActivityIntentBuilder.java