[UseZoomForDSF] Support drag&drop

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index cb1625f299254d01fc038d79ecbf8b95ef5542d0..2abb09d0ff0181fb768e8615eafd57b385ffddee 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -1940,9 +1940,11 @@ void RenderViewImpl::startDragging(WebLocalFrame* frame,
                                    WebDragOperationsMask mask,
                                    const WebImage& image,
                                    const WebPoint& webImageOffset) {
+  blink::WebRect offset_in_window(webImageOffset.x, webImageOffset.y, 0, 0);
+  convertViewportToWindow(&offset_in_window);
   DropData drop_data(DropDataBuilder::Build(data));
   drop_data.referrer_policy = frame->document().referrerPolicy();
-  gfx::Vector2d imageOffset(webImageOffset.x, webImageOffset.y);
+  gfx::Vector2d imageOffset(offset_in_window.x, offset_in_window.y);
   Send(new DragHostMsg_StartDragging(routing_id(), drop_data, mask,
                                      image.getSkBitmap(), imageOffset,
                                      possible_drag_event_info_));