Add a FOUC painting test.

Source/web/tests/sim/SimDisplayItemList.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 "config.h"
+#include "web/tests/sim/SimDisplayItemList.h"
+
+#include "core/css/parser/CSSParser.h"
+#include "platform/graphics/LoggingCanvas.h"
+#include "third_party/skia/include/core/SkPicture.h"
+#include "third_party/skia/include/core/SkRect.h"
+
+namespace blink {
+
+SimDisplayItemList::SimDisplayItemList()
+    : m_containsText(false)
+{
+}
+
+void SimDisplayItemList::appendDrawingItem(const SkPicture* picture)
+{
+    m_containsText |= picture->hasText();
+
+    SkIRect bounds = picture->cullRect().roundOut();
+    SimCanvas canvas(bounds.width(), bounds.height());
+    picture->playback(&canvas);
+    m_commands.append(canvas.commands().data(), canvas.commands().size());
+}
+
+bool SimDisplayItemList::contains(SimCanvas::CommandType type, const String& colorString) const
+{
+    RGBA32 color = 0;
+    if (!colorString.isNull())
+        RELEASE_ASSERT(CSSParser::parseColor(color, colorString, true));
+    for (auto& command : m_commands) {
+        if (command.type == type && (colorString.isNull() || command.color == color))
+            return true;
+    }
+    return false;
+}
+
+} // namespace blink