Remove offscreen_gl_context dependency from canvas_traits and script.

components/canvas_traits/Cargo.toml

@@ -21,7 +21,6 @@ gleam = "0.6.7"
 lazy_static = "1"
 malloc_size_of = { path = "../malloc_size_of" }
 malloc_size_of_derive = "0.1"
-offscreen_gl_context = {version = "0.22", features = ["serde"]}
 pixels = {path = "../pixels"}
 serde = "1.0"
 serde_bytes = "0.10"

components/canvas_traits/webgl.rs

@@ -6,7 +6,6 @@ use euclid::{Rect, Size2D};
 use gleam::gl;
 use gleam::gl::Gl;
 use ipc_channel::ipc::{IpcBytesReceiver, IpcBytesSender, IpcSharedMemory};
-use offscreen_gl_context::{GLContextAttributes, GLLimits};
 use pixels::PixelFormat;
 use std::borrow::Cow;
 use std::fmt;
@@ -811,3 +810,27 @@ pub enum YAxisTreatment {
     AsIs,
     Flipped,
 }
+
+#[derive(Clone, Copy, Debug, Deserialize, Serialize)]
+pub struct GLContextAttributes {
+    pub alpha: bool,
+    pub depth: bool,
+    pub stencil: bool,
+    pub antialias: bool,
+    pub premultiplied_alpha: bool,
+    pub preserve_drawing_buffer: bool,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct GLLimits {
+    pub max_vertex_attribs: u32,
+    pub max_tex_size: u32,
+    pub max_cube_map_tex_size: u32,
+    pub max_combined_texture_image_units: u32,
+    pub max_fragment_uniform_vectors: u32,
+    pub max_renderbuffer_size: u32,
+    pub max_texture_image_units: u32,
+    pub max_varying_vectors: u32,
+    pub max_vertex_texture_image_units: u32,
+    pub max_vertex_uniform_vectors: u32,
+}