Implement <webview> droplink event

content/browser/browser_plugin/browser_plugin_guest.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.
 
 // A BrowserPluginGuest is the browser side of a browser <--> embedder
 // renderer channel. A BrowserPlugin (a WebPlugin) is on the embedder
 // renderer side of browser <--> embedder renderer communication.
 //
 // BrowserPluginGuest lives on the UI thread of the browser process. Any
 // messages about the guest render process that the embedder might be interested
@@ skipping 378 matching lines @@
   // The is the routing ID for a swapped out RenderView for the guest
   // WebContents in the embedder's process.
   int guest_proxy_routing_id_;
   // Last seen state of drag status update.
   blink::WebDragStatus last_drag_status_;
   // Whether or not our embedder has seen a SystemDragEnded() call.
   bool seen_embedder_system_drag_ended_;
   // Whether or not our embedder has seen a DragSourceEndedAt() call.
   bool seen_embedder_drag_source_ended_at_;
 
+  // Indicates the URL dragged into the guest if any.
+  GURL dragged_url_;
+
   // Guests generate frames and send a CompositorFrameSwapped (CFS) message
   // indicating the next frame is ready to be positioned and composited.
   // Subsequent frames are not generated until the IPC is ACKed. We would like
   // to ensure that the guest generates frames on attachment so we directly ACK
   // an unACKed CFS. ACKs could get lost between the time a guest is detached
   // from a container and the time it is attached elsewhere. This mitigates this
   // race by ensuring the guest is ACKed on attachment.
   scoped_ptr<FrameMsg_CompositorFrameSwapped_Params> last_pending_frame_;
 
   // This is a queue of messages that are destined to be sent to the embedder
   // once the guest is attached to a particular embedder.
   std::deque<linked_ptr<IPC::Message> > pending_messages_;
 
   BrowserPluginGuestDelegate* const delegate_;
 
   // Weak pointer used to ask GeolocationPermissionContext about geolocation
   // permission.
   base::WeakPtrFactory<BrowserPluginGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_