Serve the web development files with CORS enabled.

The server doubles as a host for trace files to be loaded by the web
version from another origin, for example when profiling over the
local network.

profiler/wasm/httpd.py

@@ -9,6 +9,7 @@ class MyHTTPRequestHandler(server.SimpleHTTPRequestHandler):
         self.send_header("Cache-Control", "no-cache, no-store, must-revalidate")
         self.send_header("Pragma", "no-cache")
         self.send_header("Expires", "0")
+        self.send_header("Access-Control-Allow-Origin", "*");
         self.send_header("Cross-Origin-Embedder-Policy", "require-corp");
         self.send_header("Cross-Origin-Opener-Policy", "same-origin");