Show DragImage when the dragged element or its parent has transform

Source/web/tests/WebFrameTest.cpp

Index: Source/web/tests/WebFrameTest.cpp
diff --git a/Source/web/tests/WebFrameTest.cpp b/Source/web/tests/WebFrameTest.cpp
index 890bb5b1ca09794147879f80db02198e4e1c44e2..74111c6b58ccb1dad8f21a180fce3e6b3883e1f5 100644
--- a/Source/web/tests/WebFrameTest.cpp
+++ b/Source/web/tests/WebFrameTest.cpp
@@ -57,6 +57,7 @@
 #include "core/rendering/RenderView.h"
 #include "core/rendering/TextAutosizer.h"
 #include "core/rendering/compositing/RenderLayerCompositor.h"
+#include "platform/DragImage.h"
 #include "platform/UserGestureIndicator.h"
 #include "platform/geometry/FloatRect.h"
 #include "platform/network/ResourceError.h"
@@ -5449,4 +5450,40 @@ TEST_F(WebFrameTest, NotifyManifestChange)
     EXPECT_EQ(14, webFrameClient.manifestChangeCount());
 }
 
+TEST_F(WebFrameTest, NodeImageTest)
+{
+    registerMockedHttpURLLoad("nodeimage.html");
+
+    FixedLayoutTestWebViewClient client;
+    client.m_screenInfo.deviceScaleFactor = 1;
+    int viewportWidth = 100;
+    int viewportHeight = 100;
+
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    webViewHelper.initializeAndLoad(m_baseURL + "nodeimage.html", true, 0, &client);
+    webViewHelper.webView()->settings()->setViewportEnabled(true);
+    webViewHelper.webView()->resize(WebSize(viewportWidth, viewportHeight));
+    webViewHelper.webView()->layout();
+
+    SkBitmap bitmap;
+    ASSERT_TRUE(bitmap.allocN32Pixels(40, 40));
+    SkCanvas canvas(bitmap);
+    canvas.drawColor(SK_ColorGREEN);
+
+    RefPtr<WebCore::LocalFrame> frame = webViewHelper.webViewImpl()->page()->mainFrame();
+
+    // Sub Test 1
+    {
+        WebCore::Element* element = frame->document()->getElementById("case-css-transform");
+        OwnPtr<WebCore::DragImage> dragImage = frame->nodeImage(*element);
+        EXPECT_TRUE(dragImage);
+        EXPECT_EQ(40, dragImage->size().width());
+        EXPECT_EQ(40, dragImage->size().height());
+        const SkBitmap& dragBitmap = dragImage->bitmap();
+        SkAutoLockPixels lockPixel(dragBitmap);
+        EXPECT_EQ(0, memcmp(bitmap.getPixels(), dragBitmap.getPixels(), bitmap.getSize()));
+    }
+
+}
+
 } // namespace