Auto merge of #20884 - jdm:more-limits, r=avadacatavra

Don't forward GL parameter gets for constant limits.

This avoids IPC traffic for unchanging constants that are determined when the GL context is created. These changes require https://github.com/emilio/rust-offscreen-rendering-context/pull/123.

---
- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #20876.
- [x] There are tests for these changes

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components/canvas_traits/Cargo.toml

@@ -18,7 +18,7 @@ lazy_static = "1"
 malloc_size_of = { path = "../malloc_size_of" }
 malloc_size_of_derive = { path = "../malloc_size_of_derive" }
 nonzero = {path = "../nonzero"}
-offscreen_gl_context = {version = "0.16", features = ["serde"]}
+offscreen_gl_context = {version = "0.17", features = ["serde"]}
 serde = "1.0"
 serde_bytes = "0.10"
 servo_config = {path = "../config"}

components/canvas_traits/webgl.rs

@@ -480,16 +480,6 @@ parameters! {
             FrontFace = gl::FRONT_FACE,
             GenerateMipmapHint = gl::GENERATE_MIPMAP_HINT,
             GreenBits = gl::GREEN_BITS,
-            MaxCombinedTextureImageUnits = gl::MAX_COMBINED_TEXTURE_IMAGE_UNITS,
-            MaxCubeMapTextureSize = gl::MAX_CUBE_MAP_TEXTURE_SIZE,
-            MaxFragmentUniformVectors = gl::MAX_FRAGMENT_UNIFORM_VECTORS,
-            MaxRenderbufferSize = gl::MAX_RENDERBUFFER_SIZE,
-            MaxTextureImageUnits = gl::MAX_TEXTURE_IMAGE_UNITS,
-            MaxTextureSize = gl::MAX_TEXTURE_SIZE,
-            MaxVaryingVectors = gl::MAX_VARYING_VECTORS,
-            MaxVertexAttribs = gl::MAX_VERTEX_ATTRIBS,
-            MaxVertexTextureImageUnits = gl::MAX_VERTEX_TEXTURE_IMAGE_UNITS,
-            MaxVertexUniformVectors = gl::MAX_VERTEX_UNIFORM_VECTORS,
             PackAlignment = gl::PACK_ALIGNMENT,
             RedBits = gl::RED_BITS,
             SampleBuffers = gl::SAMPLE_BUFFERS,