1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "chrome/renderer/prerender/prerender_media_load_deferrer.h" 6 7 #include "base/callback_helpers.h" 8 #include "chrome/common/prerender_messages.h" 9 10 namespace prerender { 11 PrerenderMediaLoadDeferrer(content::RenderFrame * render_frame,const base::Closure & closure)12PrerenderMediaLoadDeferrer::PrerenderMediaLoadDeferrer( 13 content::RenderFrame* render_frame, 14 const base::Closure& closure) 15 : RenderFrameObserver(render_frame), 16 is_prerendering_(true), 17 continue_loading_cb_(closure) { 18 DCHECK(!continue_loading_cb_.is_null()); 19 } 20 ~PrerenderMediaLoadDeferrer()21PrerenderMediaLoadDeferrer::~PrerenderMediaLoadDeferrer() {} 22 OnMessageReceived(const IPC::Message & message)23bool PrerenderMediaLoadDeferrer::OnMessageReceived( 24 const IPC::Message& message) { 25 IPC_BEGIN_MESSAGE_MAP(PrerenderMediaLoadDeferrer, message) 26 IPC_MESSAGE_HANDLER(PrerenderMsg_SetIsPrerendering, OnSetIsPrerendering) 27 IPC_END_MESSAGE_MAP() 28 29 return false; 30 } 31 OnSetIsPrerendering(bool is_prerendering)32void PrerenderMediaLoadDeferrer::OnSetIsPrerendering(bool is_prerendering) { 33 // Prerendering can only be enabled prior to a RenderFrame's first 34 // navigation, so no PrerenderMediaLoadDeferrer should see the notification 35 // that enables prerendering. 36 DCHECK(!is_prerendering); 37 if (!is_prerendering_ || is_prerendering) 38 return; 39 40 is_prerendering_ = false; 41 base::ResetAndReturn(&continue_loading_cb_).Run(); 42 } 43 44 } // namespace prerender 45