Refactor WebIDL code generation

This commit refactors WebIDL code generation to walk over the fields of
`FirstPassRecord` instead of walking the AST again. This helps remove
redundancies like checking `is_chrome_only` as well as revisiting partial
interfaces and such. This should make it more clear that the first pass's job is
to walk the AST and collect all relevant information, while the codegen pass is
purely about appending items to a `Program`.

Additionally this refactoring will also soon be used to prepare different data
structures for operation overloadings, avoiding the need to walk those ASTs
twice.

examples/julia_set/Cargo.toml

@@ -8,3 +8,4 @@ crate-type = ["cdylib"]
 
 [dependencies]
 wasm-bindgen = { path = "../.." }
+web-sys = { path = "../../crates/web-sys" }

examples/julia_set/src/lib.rs

@@ -1,18 +1,13 @@
 extern crate wasm_bindgen;
+extern crate web_sys;
+
 use wasm_bindgen::prelude::*;
+use web_sys::{CanvasRenderingContext2D, ImageData};
 
 mod fractal;
 use fractal::get_julia_set;
 use fractal::complex::Complex;
 
-#[wasm_bindgen]
-extern "C" {
-    pub type ImageData;
-
-    #[wasm_bindgen(constructor)]
-    pub fn new(arr: &Uint8ClampedArray, width: u32, height: u32) -> ImageData;
-}
-
 #[wasm_bindgen]
 extern "C" {
     pub type Uint8ClampedArray;
@@ -21,19 +16,13 @@ extern "C" {
     pub fn new(arr: &[u8]) -> Uint8ClampedArray;
 }
 
-#[wasm_bindgen]
-extern "C" {
-    pub type CanvasRenderingContext2D;
-
-    #[wasm_bindgen(method, js_name = putImageData)]
-    pub fn put_image_data(this: &CanvasRenderingContext2D, image_data: &ImageData, p_1: i32, p_2: i32);
-}
-
 #[wasm_bindgen]
 pub fn draw(ctx: &CanvasRenderingContext2D, width: u32, height: u32, real: f64, imaginary: f64) {
     let c = Complex { real, imaginary };
     let data = get_julia_set(width, height, c);
     let uint8_array = Uint8ClampedArray::new(&data);
 
-    ctx.put_image_data(&ImageData::new(&uint8_array, width, height), 0, 0);
+    ctx.put_image_data(
+        &ImageData::with_data_and_sw_and_sh_with_sh(&data, width, height).unwrap(),
+        0.0, 0.0);
 }