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

third_party/WebKit/Source/web/tests/sim/SimPage.h

Index: third_party/WebKit/Source/web/tests/sim/SimPage.h
diff --git a/third_party/WebKit/Source/web/tests/sim/SimPage.h b/third_party/WebKit/Source/web/tests/sim/SimPage.h
new file mode 100644
index 0000000000000000000000000000000000000000..9836ae528627c503eaf2fdf4f87abcf6113f4bd9
--- /dev/null
+++ b/third_party/WebKit/Source/web/tests/sim/SimPage.h
@@ -0,0 +1,30 @@
+// Copyright 2016 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.
+
+#ifndef SimPage_h
+#define SimPage_h
+
+#include "platform/heap/Persistent.h"
+
+namespace blink {
+
+class Page;
+
+class SimPage final {
+ public:
+  explicit SimPage();
+  ~SimPage();
+
+  void setPage(Page*);
+
+  void setFocused(bool);
+  bool isFocused() const;
+
+ private:
+  Persistent<Page> m_page;
+};
+
+}  // namespace blink
+
+#endif