Port some AOM tests from LayoutTests to SimTests.

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

Index: third_party/WebKit/Source/web/tests/sim/SimTest.cpp
diff --git a/third_party/WebKit/Source/web/tests/sim/SimTest.cpp b/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
index 2a8e66e79baf943a992ca259f9a7a386f5f54bed..b1dbdf1e15a13ed475a609235db23cc35e2bd7d9 100644
--- a/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
+++ b/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
@@ -10,11 +10,29 @@
 #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
@@ -77,4 +95,11 @@ 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