Merge "Add enable_angle_allow_list flag" into main

    bug: "361329788"

    is_exported: true

}

flag {

    name: "enable_angle_allow_list"

    namespace: "gpu"

    description: "Whether to read from angle allowlist to determine if app should use ANGLE"

    is_fixed_read_only: true

    bug: "370845648"

}