Like in #37713, instead of updating images directly with webrender api
we use the compositor api. We still keep webrender api available in
webgl, because that's where we do shutdown, due to GL.
Testing: Existing WPT tests
Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
canvas crate was home for both webgl and 2dcanvas impl, but it makes
more sense to separate these two, by splitting webgl into standalone
crate (like we already have for webgpu).
Testing: Rust for fearless refactoring (but there are WPT tests just in
case)
Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>
