Replace LayoutTests/paint/invalidation/text-selection-focus.html with a SimTest.

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 476be18f861361564c7d0c1aa4f0d289e7217443..a3e01fe09faf235281df41b91589a4483b7dec63 100644
--- a/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
+++ b/third_party/WebKit/Source/web/tests/sim/SimTest.cpp
@@ -5,6 +5,7 @@
 #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"
@@ -26,6 +27,7 @@ SimTest::SimTest() : m_webViewClient(m_compositor) {
   ScrollbarTheme::setMockScrollbarsEnabled(true);
   m_webViewHelper.initialize(true, nullptr, &m_webViewClient);
   m_compositor.setWebViewImpl(webView());
+  m_page.setPage(webView().page());
 }
 
 SimTest::~SimTest() {
@@ -43,6 +45,14 @@ void SimTest::loadURL(const String& url) {
   webView().mainFrameImpl()->loadRequest(request);
 }
 
+LocalDOMWindow& SimTest::window() {

[ojan, 2016/11/22 00:46:27]

This really makes me want a WebModules thing or something so that we could
expose just the web-exposed APIs instead of the whole internal API. Not worth
blocking this patch obviously.

+  return *document().domWindow();
+}
+
+SimPage& SimTest::page() {
+  return m_page;
+}
+
 Document& SimTest::document() {
   return *webView().mainFrameImpl()->frame()->document();
 }