chrome/renderer/chrome_render_frame_observer.cc

   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/chrome_render_frame_observer.h"
   6
   7 #include "chrome/common/prerender_messages.h"
   8 #include "chrome/renderer/prerender/prerender_helper.h"
   9
  10 ChromeRenderFrameObserver::ChromeRenderFrameObserver(
  11     content::RenderFrame* render_frame)
  12     : content::RenderFrameObserver(render_frame) {
  13 }
  14
  15 ChromeRenderFrameObserver::~ChromeRenderFrameObserver() {
  16 }
  17
  18 bool ChromeRenderFrameObserver::OnMessageReceived(const IPC::Message& message) {
  19   // Filter only.
  20   IPC_BEGIN_MESSAGE_MAP(ChromeRenderFrameObserver, message)
  21     IPC_MESSAGE_HANDLER(PrerenderMsg_SetIsPrerendering, OnSetIsPrerendering);
  22   IPC_END_MESSAGE_MAP()
  23
  24   return false;
  25 }
  26
  27 void ChromeRenderFrameObserver::OnSetIsPrerendering(bool is_prerendering) {
  28   if (is_prerendering) {
  29     // If the PrerenderHelper for this frame already exists, don't create it. It
  30     // can already be created for subframes during handling of
  31     // RenderFrameCreated, if the parent frame was prerendering at time of
  32     // subframe creation.
  33     if (prerender::PrerenderHelper::Get(render_frame()))
  34       return;
  35
  36     // The PrerenderHelper will destroy itself either after recording histograms
  37     // or on destruction of the RenderView.
  38     new prerender::PrerenderHelper(render_frame());
  39   }
  40 }