Implement <webview> droplink event

extensions/browser/guest_view/web_view/web_view_guest.cc

 // Copyright 2014 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 "extensions/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 256 matching lines @@
       owner_render_process_host->GetBrowserContext(),
       guest_site_instance);
   params.guest_delegate = this;
   callback.Run(WebContents::Create(params));
 }
 
 void WebViewGuest::DidAttachToEmbedder() {
   ApplyAttributes(*attach_params());
 }
 
+void WebViewGuest::DidDropLink(const GURL& url) {
+  scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
+  args->SetString(guestview::kUrl, url.spec());
+  DispatchEventToView(
+      new GuestViewBase::Event(webview::kEventDropLink, args.Pass()));
+}
+
 void WebViewGuest::DidInitialize(const base::DictionaryValue& create_params) {
   script_executor_.reset(
       new ScriptExecutor(web_contents(), &script_observers_));
 
   notification_registrar_.Add(this,
                               content::NOTIFICATION_LOAD_COMPLETED_MAIN_FRAME,
                               content::Source<WebContents>(web_contents()));
 
   notification_registrar_.Add(this,
                               content::NOTIFICATION_RESOURCE_RECEIVED_REDIRECT,
@@ skipping 975 matching lines @@
       WebViewGuest::From(owner_web_contents()->GetRenderProcessHost()->GetID(),
                          new_window_instance_id);
   if (!guest)
     return;
 
   if (!allow)
     guest->Destroy();
 }
 
 }  // namespace extensions