[UseZoomForDSF] Support drag&drop

content/renderer/render_view_impl.cc

 // Copyright (c) 2012 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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 1922 matching lines @@
 void RenderViewImpl::setKeyboardFocusURL(const WebURL& url) {
   focus_url_ = GURL(url);
   UpdateTargetURL(focus_url_, mouse_over_url_);
 }
 
 void RenderViewImpl::startDragging(WebLocalFrame* frame,
                                    const WebDragData& data,
                                    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_));
 }
 
 bool RenderViewImpl::acceptsLoadDrops() {
   return renderer_preferences_.can_accept_load_drops;
 }
 
 void RenderViewImpl::focusNext() {
@@ skipping 1539 matching lines @@
   if (IsUseZoomForDSFEnabled()) {
     webview()->setZoomFactorForDeviceScaleFactor(device_scale_factor_);
   } else {
     webview()->setDeviceScaleFactor(device_scale_factor_);
   }
   webview()->settings()->setPreferCompositingToLCDTextEnabled(
       PreferCompositingToLCDText(compositor_deps_, device_scale_factor_));
 }
 
 }  // namespace content