Implement <webview> droplink event

content/browser/browser_plugin/browser_plugin_embedder.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/browser/browser_plugin/browser_plugin_embedder.h"
 
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/browser_plugin/browser_plugin_messages.h"
@@ skipping 15 matching lines @@
 
 BrowserPluginEmbedder::~BrowserPluginEmbedder() {
 }
 
 // static
 BrowserPluginEmbedder* BrowserPluginEmbedder::Create(
     WebContentsImpl* web_contents) {
   return new BrowserPluginEmbedder(web_contents);
 }
 
-void BrowserPluginEmbedder::DragEnteredGuest(BrowserPluginGuest* guest) {
+bool BrowserPluginEmbedder::DragEnteredGuest(BrowserPluginGuest* guest) {
   guest_dragging_over_ = guest->AsWeakPtr();
+  return guest_started_drag_.get() == guest;
 }
 
 void BrowserPluginEmbedder::DragLeftGuest(BrowserPluginGuest* guest) {
   // Avoid race conditions in switching between guests being hovered over by
   // only un-setting if the caller is marked as the guest being dragged over.
   if (guest_dragging_over_.get() == guest) {
     guest_dragging_over_.reset();
   }
 }
 
@@ skipping 70 matching lines @@
   // to the guest that initiated the drag/drop operation. This will ensure that
   // the guest's RVH state is reset properly.
   if (guest_started_drag_)
     guest_started_drag_->EmbedderSystemDragEnded();
 
   guest_dragging_over_.reset();
   ClearGuestDragStateIfApplicable();
 }
 
 void BrowserPluginEmbedder::OnUpdateDragCursor(bool* handled) {
-  *handled = (guest_dragging_over_.get() != NULL);
+  *handled = !!guest_dragging_over_;
 }
 
 void BrowserPluginEmbedder::OnAttach(
     RenderFrameHost* render_frame_host,
     int browser_plugin_instance_id,
     const BrowserPluginHostMsg_Attach_Params& params) {
   // TODO(fsamuel): Change message routing to use the process ID of the
   // |render_frame_host| once BrowserPlugin IPCs get routed using the RFH
   // routing ID. See http://crbug.com/436339.
   WebContents* guest_web_contents =
@@ skipping 73 matching lines @@
   if (static_cast<WebContentsImpl*>(guest)->GetBrowserPluginGuest()
           ->StopFinding(action)) {
     // There can only ever currently be one browser plugin that handles find so
     // we can break the iteration at this point.
     return true;
   }
   return false;
 }
 
 }  // namespace content