Port some AOM tests from LayoutTests to SimTests.

third_party/WebKit/Source/web/tests/sim/SimTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "web/tests/sim/SimTest.h"
 
 #include "core/dom/Document.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "platform/LayoutTestSupport.h"
 #include "platform/scroll/ScrollbarTheme.h"
 #include "platform/testing/UnitTestHelpers.h"
 #include "public/platform/WebCache.h"
+#include "public/web/WebScriptExecutionCallback.h"
+#include "public/web/WebScriptSource.h"
 #include "web/WebLocalFrameImpl.h"
 #include "web/WebViewImpl.h"
 
 namespace blink {
 
+namespace {
+class ScriptExecutionCallbackHelper : public WebScriptExecutionCallback {
+ public:
+  const String Result() const { return result_; }
+
+ private:
+  void Completed(const WebVector<v8::Local<v8::Value>>& values) override {
+    if (!values.IsEmpty() && !values[0].IsEmpty() && values[0]->IsString()) {
+      result_ = ToCoreString(v8::Local<v8::String>::Cast(values[0]));
+    }
+  }
+
+  String result_;
+};
+}  // namespace
+
 SimTest::SimTest() : web_view_client_(compositor_), web_frame_client_(*this) {
   Document::SetThreadedParsingEnabledForTesting(false);
   // Use the mock theme to get more predictable code paths, this also avoids
   // the OS callbacks in ScrollAnimatorMac which can schedule frames
   // unpredictably since the OS will randomly call into blink for
   // updateScrollerStyleForNewRecommendedScrollerStyle which then does
   // FrameView::scrollbarStyleChanged and will adjust the scrollbar existence
   // in the middle of a test.
   LayoutTestSupport::SetMockThemeEnabledForTest(true);
   ScrollbarTheme::SetMockScrollbarsEnabled(true);
@@ skipping 42 matching lines @@
 }
 
 SimCompositor& SimTest::Compositor() {
   return compositor_;
 }
 
 void SimTest::AddConsoleMessage(const String& message) {
   console_messages_.push_back(message);
 }
 
+String SimTest::ExecuteJavaScript(String script_source) {
+  ScriptExecutionCallbackHelper callback_helper;
+  WebView().MainFrame()->ToWebLocalFrame()->RequestExecuteScriptAndReturnValue(

[esprehn, 2017/04/20 19:54:07]

Since you can access the core types directly this should be:

...GetScriptController().ExecuteScriptInMainWorld(source)

+      WebScriptSource(WebString(script_source)), false, &callback_helper);
+  return callback_helper.Result();
+}
+
 }  // namespace blink