Import Cobalt 19.master.0.203780

Includes the following patches:
  https://cobalt-review.googlesource.com/c/cobalt/+/5210
    by errong.leng@samsung.com
  https://cobalt-review.googlesource.com/c/cobalt/+/5270
    by linus.wang@samsung.com
diff --git a/src/third_party/web_platform_tests/eventsource/resources/init.htm b/src/third_party/web_platform_tests/eventsource/resources/init.htm
new file mode 100644
index 0000000..7c56d88
--- /dev/null
+++ b/src/third_party/web_platform_tests/eventsource/resources/init.htm
@@ -0,0 +1,9 @@
+<!doctype html>
+<html>
+  <head>
+    <title>support init file</title>
+  </head>
+  <body>
+    <script> parent.init() </script>
+  </body>
+</html>