Fix the scale of Drag and Drop shadow image.

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

Index: third_party/WebKit/Source/core/frame/LocalFrameTest.cpp
diff --git a/third_party/WebKit/Source/core/frame/LocalFrameTest.cpp b/third_party/WebKit/Source/core/frame/LocalFrameTest.cpp
index 66f554427241956fe15aa623fb9fa343b1b4cf20..09ba4306eebf8160579e13884ad67cf15c7a751f 100644
--- a/third_party/WebKit/Source/core/frame/LocalFrameTest.cpp
+++ b/third_party/WebKit/Source/core/frame/LocalFrameTest.cpp
@@ -4,7 +4,10 @@
 
 #include "core/frame/LocalFrame.h"
 
+#include "core/editing/FrameSelection.h"
+#include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
+#include "core/frame/VisualViewport.h"
 #include "core/html/HTMLElement.h"
 #include "core/testing/DummyPageHolder.h"
 #include "platform/DragImage.h"
@@ -122,4 +125,23 @@ TEST_F(LocalFrameTest, nodeImageWithChangingLayoutObject)
         << "#sample doesn't have :-webkit-drag.";
 }
 
+TEST_F(LocalFrameTest, dragImageForSelectionUsesPageScaleFactor)
+{
+    setBodyContent(
+        "<div>Hello world! This tests that the bitmap for drag image is scaled by page scale factor</div>");
+    frame().host()->visualViewport().setScale(1);
+    frame().selection().selectAll();
+    updateAllLifecyclePhases();
+    const std::unique_ptr<DragImage> image1(frame().dragImageForSelection(0.75f));
+    frame().host()->visualViewport().setScale(2);
+    frame().selection().selectAll();
+    updateAllLifecyclePhases();
+    const std::unique_ptr<DragImage> image2(frame().dragImageForSelection(0.75f));
+
+    EXPECT_GT(image1->size().width(), 0);
+    EXPECT_GT(image1->size().height(), 0);
+    EXPECT_EQ(image1->size().width() * 2, image2->size().width());
+    EXPECT_EQ(image1->size().height() * 2, image2->size().height());
+}
+
 } // namespace blink