Protocol handler dialogs should only be enabled by browser or page actions [Not committed]

chrome/browser/extensions/api/messaging/message_service.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 "chrome/browser/extensions/api/messaging/message_service.h"
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/json/json_writer.h"
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram.h"
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/api/messaging/extension_message_port.h"
 #include "chrome/browser/extensions/api/messaging/incognito_connectability.h"
 #include "chrome/browser/extensions/api/messaging/native_message_port.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/extensions/extension_util.h"
+#include "chrome/browser/external_protocol/external_protocol_handler.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/tab_contents/tab_util.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/extensions/manifest_handlers/externally_connectable.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/site_instance.h"
@@ skipping 612 matching lines @@
 }
 
 void MessageService::DispatchMessage(int source_port_id,
                                      MessageChannel* channel,
                                      const Message& message) {
   // Figure out which port the ID corresponds to.
   int dest_port_id = GET_OPPOSITE_PORT_ID(source_port_id);
   MessagePort* port = IS_OPENER_PORT_ID(dest_port_id) ?
       channel->opener.get() : channel->receiver.get();
 
+  if (message.user_gesture)
+    ExternalProtocolHandler::PermitLaunchUrl();
   port->DispatchOnMessage(message, dest_port_id);
 }
 
 bool MessageService::MaybeAddPendingLazyBackgroundPageOpenChannelTask(
     Profile* profile,
     const Extension* extension,
     OpenChannelParams* params) {
   if (!BackgroundInfo::HasLazyBackgroundPage(extension))
     return false;
 
@@ skipping 91 matching lines @@
 }
 
 void MessageService::DispatchOnDisconnect(content::RenderProcessHost* source,
                                           int port_id,
                                           const std::string& error_message) {
   ExtensionMessagePort port(source, MSG_ROUTING_CONTROL, "");
   port.DispatchOnDisconnect(GET_OPPOSITE_PORT_ID(port_id), error_message);
 }
 
 }  // namespace extensions