Drag-and-drop: Target drag messages to specific RenderWidgets.

content/browser/web_contents/web_contents_view_mus.h

 // 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.
 
 #ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MUS_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MUS_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 62 matching lines @@
   void CloseTabAfterEventTracking() override;
 #endif
 
   // Backend implementation of RenderViewHostDelegateView.
   void ShowContextMenu(RenderFrameHost* render_frame_host,
                        const ContextMenuParams& params) override;
   void StartDragging(const DropData& drop_data,
                      blink::WebDragOperationsMask allowed_ops,
                      const gfx::ImageSkia& image,
                      const gfx::Vector2d& image_offset,
-                     const DragEventSourceInfo& event_info) override;
+                     const DragEventSourceInfo& event_info,
+                     RenderWidgetHost* source_rwh) override;
   void UpdateDragCursor(blink::WebDragOperation operation) override;
   void GotFocus() override;
   void TakeFocus(bool reverse) override;
 
   // Overridden from aura::WindowDelegate:
   gfx::Size GetMinimumSize() const override;
   gfx::Size GetMaximumSize() const override;
   void OnBoundsChanged(const gfx::Rect& old_bounds,
                        const gfx::Rect& new_bounds) override;
   gfx::NativeCursor GetCursor(const gfx::Point& point) override;
@@ skipping 17 matching lines @@
   std::unique_ptr<WebContentsViewDelegate> delegate_;
   std::unique_ptr<aura::Window> aura_window_;
   std::unique_ptr<ui::ScopedWindowPtr> mus_window_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewMus);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_MUS_H_