Use the screen info's scale factor to scale the drag image

third_party/WebKit/Source/web/DragClientImpl.cpp

Index: third_party/WebKit/Source/web/DragClientImpl.cpp
diff --git a/third_party/WebKit/Source/web/DragClientImpl.cpp b/third_party/WebKit/Source/web/DragClientImpl.cpp
index 838fc0d9606e64b9cae58462177ecabd34fa1b16..c5e8a4480aca188f1bc8a157d92879e50f0bb3fc 100644
--- a/third_party/WebKit/Source/web/DragClientImpl.cpp
+++ b/third_party/WebKit/Source/web/DragClientImpl.cpp
@@ -33,6 +33,7 @@
 #include "core/clipboard/DataObject.h"
 #include "core/clipboard/DataTransfer.h"
 #include "core/frame/LocalFrame.h"
+#include "core/page/ChromeClient.h"

[jbroman, 2016/01/13 15:35:13]

nit: Why this include? You don't seem to have added a use of ChromeClient.

[oshima, 2016/01/13 18:19:43]

m_webView->client() returns ChromeClient

[dcheng, 2016/01/13 18:20:53]

This returns WebViewClient, not ChromeClient.

 #include "platform/DragImage.h"
 #include "platform/geometry/IntSize.h"
 #include "public/platform/WebCommon.h"
@@ -69,9 +70,11 @@ void DragClientImpl::startDrag(DragImage* dragImage, const IntPoint& dragImageOr
 
     if (dragImage) {
         float resolutionScale = dragImage->resolutionScale();
-        if (m_webView->deviceScaleFactor() != resolutionScale) {
+        float deviceScaleFactor =
+            m_webView->client()->screenInfo().deviceScaleFactor;
+        if (deviceScaleFactor != resolutionScale) {
             ASSERT(resolutionScale > 0);
-            float scale = m_webView->deviceScaleFactor() / resolutionScale;
+            float scale = deviceScaleFactor / resolutionScale;
             dragImage->scale(scale, scale);
         }
         image = dragImage->bitmap();