[Android] Upstream external_protocol_dialog_android.cc

chrome/browser/ui/android/external_protocol_dialog_android.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 "base/logging.h"
+#include "chrome/browser/android/tab_android.h"
 #include "chrome/browser/external_protocol/external_protocol_handler.h"
+#include "chrome/browser/tab_contents/tab_util.h"
+#include "content/public/browser/web_contents.h"
+
+using content::WebContents;
 
 // static
 void ExternalProtocolHandler::RunExternalProtocolDialog(
     const GURL& url, int render_process_host_id, int routing_id) {
-  NOTIMPLEMENTED() << "TODO(mkosiba): Upstream the actual implementation.";
+  WebContents* web_contents = tab_util::GetWebContentsByID(
+      render_process_host_id, routing_id);
+  if (web_contents) {
+    TabAndroid* tab = TabAndroid::FromWebContents(web_contents);
+    if (tab)
+      return tab->RunExternalProtocolDialog(url);
+  }
 }