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

content/browser/renderer_host/render_view_host_delegate_view.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_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_VIEW_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_VIEW_H_
 
 #include <vector>
 
 #include "base/callback.h"
 #include "build/build_config.h"
 #include "content/common/content_export.h"
 #include "content/common/drag_event_source_info.h"
 #include "third_party/WebKit/public/platform/WebDragOperation.h"
 
 namespace gfx {
 class ImageSkia;
 class Rect;
 class Vector2d;
 }
 
 namespace content {
 class RenderFrameHost;
+class RenderWidgetHostImpl;
 struct ContextMenuParams;
 struct DropData;
 struct MenuItem;
 
 // This class provides a way for the RenderViewHost to reach out to its
-// delegate's view. It only needs to be implemented by embedders if they don't
-// use the default WebContentsView implementations.
+// delegate's view.
 class CONTENT_EXPORT RenderViewHostDelegateView {
  public:
   // A context menu should be shown, to be built using the context information
   // provided in the supplied params.
   virtual void ShowContextMenu(RenderFrameHost* render_frame_host,
                                const ContextMenuParams& params) {}
 
   // The user started dragging content of the specified type within the
   // RenderView. Contextual information about the dragged content is supplied
   // by DropData. If the delegate's view cannot start the drag for /any/
   // reason, it must inform the renderer that the drag has ended; otherwise,
   // this results in bugs like http://crbug.com/157134.
   virtual void StartDragging(const DropData& drop_data,
                              blink::WebDragOperationsMask allowed_ops,
                              const gfx::ImageSkia& image,
                              const gfx::Vector2d& image_offset,
-                             const DragEventSourceInfo& event_info) {}
+                             const DragEventSourceInfo& event_info,
+                             RenderWidgetHostImpl* source_rwh) {}
 
   // The page wants to update the mouse cursor during a drag & drop operation.
   // |operation| describes the current operation (none, move, copy, link.)
   virtual void UpdateDragCursor(blink::WebDragOperation operation) {}
 
   // Notification that view for this delegate got the focus.
   virtual void GotFocus() {}
 
   // Callback to inform the browser that the page is returning the focus to
   // the browser's chrome. If reverse is true, it means the focus was
@@ skipping 17 matching lines @@
   virtual void HidePopupMenu() {};
 #endif
 
  protected:
   virtual ~RenderViewHostDelegateView() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_DELEGATE_VIEW_H_