Selection API: Do not change focus by Selection functions.

third_party/WebKit/LayoutTests/editing/spelling/spellcheck_test.js

Index: third_party/WebKit/LayoutTests/editing/spelling/spellcheck_test.js
diff --git a/third_party/WebKit/LayoutTests/editing/spelling/spellcheck_test.js b/third_party/WebKit/LayoutTests/editing/spelling/spellcheck_test.js
index 67bb9c670145c080b9f113a3f0459ce422f7d6dd..197c23647238fc1814a2a4b452d59c97d20f41b4 100644
--- a/third_party/WebKit/LayoutTests/editing/spelling/spellcheck_test.js
+++ b/third_party/WebKit/LayoutTests/editing/spelling/spellcheck_test.js
@@ -322,6 +322,16 @@ function verifyMarkers(
   }
 }
 
+function focusNearestAncestorOfAnchor(selection) {
+  for (var anchor = selection.anchorNode; anchor; anchor = anchor.parentNode) {
+    if (anchor.nodeType != Node.ELEMENT_NODE)
+      continue;
+    anchor.focus();
+    if (anchor.ownerDocument.activeElement == anchor)
+      return;
+  }
+}
+
 // Spellchecker gets triggered not only by text and selection change, but also
 // by focus change. For example, misspelling markers in <INPUT> disappear when
 // the window loses focus, even though the selection does not change.
@@ -349,6 +359,7 @@ function invokeSpellcheckTest(testObject, input, tester, expectedText) {
     /** @type {!Sample} */
     const sample = typeof(input) === 'string' ? new Sample(input) : input;
     testObject.sample = sample;
+    focusNearestAncestorOfAnchor(sample.selection);
 
     if (typeof(tester) === 'function') {
       tester.call(window, sample.document);