Rewrite and organize tests in LayoutTests/shadow-dom

third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js

Index: third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js
diff --git a/third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js b/third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js
index c11861a1321ad0fb2cd6a5336233d5f9105bb0b8..f17927726f861685cec628f0659f5d7140250e23 100644
--- a/third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js
+++ b/third_party/WebKit/LayoutTests/shadow-dom/resources/shadow-dom.js
@@ -72,7 +72,13 @@ function createTestTree(node) {
   function attachShadowFromTemplate(template) {
     let parent = template.parentNode;
     parent.removeChild(template);
-    let shadowRoot = parent.attachShadow({mode: template.getAttribute('data-mode')});
+    let shadowRoot;
+    if (template.getAttribute('data-mode') === 'v0') {
+      // For legacy Shadow DOM
+      shadowRoot = parent.createShadowRoot();
+    } else {
+      shadowRoot = parent.attachShadow({mode: template.getAttribute('data-mode')});
+    }
     let id = template.id;
     if (id) {
       shadowRoot.id = id;
@@ -158,6 +164,14 @@ function dispatchUAEventWithLog(nodes, target, eventType, callback) {
   return log;
 }
 
+function makeExpectedEventPathLog(path) {
+  let expectedLog = [];
+  for (let i of path) {
+    expectedLog.push([i, null, path]);
+  }
+  return expectedLog;
+}
+
 // This function assumes that testharness.js is available.
 function assert_event_path_equals(actual, expected) {
   assert_equals(actual.length, expected.length);