In addition to updating gfx/webrender and gfx/webrender_traits, as well as the
Cargo.toml/Cargo.lock files and third-party rust dependencies, this updates
webrender_bindings for the following API changes:
- Update call to update_image for change in 086f912ea86d053d95e5f4eec00cae0d82ee5dba
- Update request_blob_image for new parameter added in 086f912ea86d053d95e5f4eec00cae0d82ee5dba.
- set_root_display_list got renamed to set_display_list, so update call sites.