Implement <webview> droplink event

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index eacef42e6fe5200bde185713101f503d660a4bc4..8b9bfb0391399deca42ff8a2b7724d372417e117 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -274,6 +274,13 @@ 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_));