DevTools: Page.setDocumentContent without using DOMPatchSupport

third_party/WebKit/LayoutTests/inspector-protocol/page/setDocumentContent.js

+(async function(testRunner) {
+  let {page, session, dp} = await testRunner.startHTML(`<div>Привет мир</div>`,
+      'Tests that Page.setDocumentContent works.');
+
+  await dp.Page.enable();
+  testRunner.log('Page enabled');
+
+  var resourceTreeResponse = await dp.Page.getResourceTree();
+  var mainFrameId = resourceTreeResponse.result.frameTree.frame.id;
+  testRunner.log('Main Frame obtained');
+
+  testRunner.log('Document content before: ' + await session.evaluate(() => document.documentElement.outerHTML));
+  await dp.Page.setDocumentContent({frameId: mainFrameId, html: '<div>こんにちは世界</div>'});
+  testRunner.log('Document content set');
+  testRunner.log('Document content after: ' + await session.evaluate(() => document.documentElement.outerHTML));
+
+  testRunner.completeTest();
+})