Merge "Change letterbox background default solid color" into udc-qpr-dev

        the Option 3 is selected for R.integer.config_letterboxBackgroundType.

        Values < 0 or >= 1 are ignored and 0.0 (transparent) is used instead. -->

    <item name="config_letterboxBackgroundWallaperDarkScrimAlpha" format="float" type="dimen">

        0.68

        0.75

    </item>

    <!-- Corners appearance of the letterbox background.

            but isn't supported on the device or both dark scrim alpha and blur radius aren't

            provided.

     -->

    <color name="config_letterboxBackgroundColor">@color/system_on_secondary_fixed</color>

    <color name="config_letterboxBackgroundColor">@color/system_neutral1_1000</color>

    <!-- Horizontal position of a center of the letterboxed app window.

        0 corresponds to the left side of the screen and 1 to the right side. If given value < 0