Make LocalFrame::nodeImage() to take an image for the element with :-webkit-drag pseudo class

third_party/WebKit/Source/core/frame/LocalFrameTest.cpp

+// 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.
+
+#include "core/frame/LocalFrame.h"
+
+#include "core/frame/FrameView.h"
+#include "core/html/HTMLElement.h"
+#include "core/testing/DummyPageHolder.h"
+#include "platform/DragImage.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace blink {
+
+class LocalFrameTest : public ::testing::Test {
+protected:
+    LocalFrameTest() = default;
+    ~LocalFrameTest() override = default;
+
+    Document& document() const { return m_dummyPageHolder->document(); }
+    LocalFrame& frame() const { return *document().frame(); }
+
+    void setBodyContent(const std::string& bodyContent)
+    {
+        document().body()->setInnerHTML(String::fromUTF8(bodyContent.c_str()), ASSERT_NO_EXCEPTION);
+    }
+
+    void updateAllLifecyclePhases()
+    {
+        document().view()->updateAllLifecyclePhases();
+    }
+
+private:
+    void SetUp() override
+    {
+        m_dummyPageHolder = DummyPageHolder::create(IntSize(800, 600));
+    }
+
+    std::unique_ptr<DummyPageHolder> m_dummyPageHolder;
+};
+
+TEST_F(LocalFrameTest, nodeImage)
+{
+    setBodyContent(
+        "<style>"
+        "#sample { width: 100px; height: 100px; }"
+        "</style>"
+        "<div id=sample></div>");
+    Element* sample = document().getElementById("sample");
+    const std::unique_ptr<DragImage> image = frame().nodeImage(*sample);
+    EXPECT_EQ(IntSize(100, 100), image->size());
+}
+
+TEST_F(LocalFrameTest, nodeImageWithPsuedoClassWebKitDrag)
+{
+    setBodyContent(
+        "<style>"
+        "#sample { width: 100px; height: 100px; }"
+        "#sample:-webkit-drag { width: 200px; height: 200px; }"
+        "</style>"
+        "<div id=sample></div>");
+    Element* sample = document().getElementById("sample");
+    const std::unique_ptr<DragImage> image = frame().nodeImage(*sample);
+    EXPECT_EQ(IntSize(200, 200), image->size())
+        << ":-webkit-drag should affect dragged image.";
+}
+
+TEST_F(LocalFrameTest, nodeImageWithoutDraggedLayoutObject)
+{
+    setBodyContent(
+        "<style>"
+        "#sample { width: 100px; height: 100px; }"
+        "#sample:-webkit-drag { display:none }"
+        "</style>"
+        "<div id=sample></div>");
+    Element* sample = document().getElementById("sample");
+    const std::unique_ptr<DragImage> image = frame().nodeImage(*sample);
+    EXPECT_EQ(nullptr, image.get())
+        << ":-webkit-drag blows away layout object";
+}
+
+} // namespace blink