Make WindowBuilder Send + Sync

Window builder is always accessed by winit on the thread event loop
is on, thus it's safe to mark the data it gets as `Send + Sync`.
Each unsafe object is marked individually as `Send + Sync` instead
of just implementing `Send` and `Sync` for the whole builder.

src/platform_impl/web/web_sys/canvas.rs

@@ -63,7 +63,7 @@ impl Canvas {
         attr: &WindowAttributes,
         platform_attr: PlatformSpecificWindowBuilderAttributes,
     ) -> Result<Self, RootOE> {
-        let canvas = match platform_attr.canvas {
+        let canvas = match platform_attr.canvas.0 {
             Some(canvas) => canvas,
             None => document
                 .create_element("canvas")
@@ -127,7 +127,7 @@ impl Canvas {
             super::set_canvas_position(&common.document, &common.raw, &common.style, position);
         }
 
-        if attr.fullscreen.is_some() {
+        if attr.fullscreen.0.is_some() {
             common.fullscreen_handler.request_fullscreen();
         }
 

src/platform_impl/web/window.rs

@@ -5,6 +5,7 @@ use crate::window::{
     CursorGrabMode, CursorIcon, ImePurpose, ResizeDirection, Theme, UserAttentionType,
     WindowAttributes, WindowButtons, WindowId as RootWI, WindowLevel,
 };
+use crate::SendSyncWrapper;
 
 use web_sys::HtmlCanvasElement;
 
@@ -455,7 +456,7 @@ impl From<u64> for WindowId {
 
 #[derive(Clone)]
 pub struct PlatformSpecificWindowBuilderAttributes {
-    pub(crate) canvas: Option<backend::RawCanvasType>,
+    pub(crate) canvas: SendSyncWrapper<Option<backend::RawCanvasType>>,
     pub(crate) prevent_default: bool,
     pub(crate) focusable: bool,
     pub(crate) append: bool,
@@ -464,7 +465,7 @@ pub struct PlatformSpecificWindowBuilderAttributes {
 impl Default for PlatformSpecificWindowBuilderAttributes {
     fn default() -> Self {
         Self {
-            canvas: None,
+            canvas: SendSyncWrapper(None),
             prevent_default: true,
             focusable: true,
             append: false,