Defer loading of audio/video tags while prerendering.

chrome/renderer/prerender/prerender_helper.cc

 // Copyright (c) 2011 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/renderer/prerender/prerender_helper.h"
 
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "chrome/common/render_messages.h"
 #include "content/renderer/navigation_state.h"
@@ skipping 90 matching lines @@
     perceived_load_time = base::TimeDelta::FromSeconds(0);
   }
   RECORD_PLT("RendererPerceivedPLT", perceived_load_time);
   RECORD_PLT("RendererPerceivedPLTMatched", perceived_load_time);
 
   // Once a prerendered page is displayed and its histograms recorded, it no
   // longer needs a PrerenderHelper.
   delete prerender_helper;
 }
 
-void PrerenderHelper::WillCreateMediaPlayer(
-    WebKit::WebFrame* frame,
-    WebKit::WebMediaPlayerClient* client) {
-  if (is_prerendering_) {
-    // Cancel prerendering in the case of HTML5 media, to avoid playing sounds
-    // in the background.
-    Send(new ChromeViewHostMsg_MaybeCancelPrerenderForHTML5Media(
-         render_view()->routing_id()));
-  }
-}
-
 void PrerenderHelper::DidStartProvisionalLoad(WebKit::WebFrame* frame) {
   // If this is the first provisional load since prerendering started, get its
   // request time.
   if (is_prerendering_ && prerender_start_time_.is_null()) {
     WebKit::WebDataSource* data_source = frame->provisionalDataSource();
     if (!data_source) {
       NOTREACHED();
       return;
     }
     NavigationState* navigation_state =
@@ skipping 34 matching lines @@
 
 void PrerenderHelper::UpdateVisibilityState() {
   if (render_view()->webview()) {
     render_view()->webview()->setVisibilityState(
         render_view()->visibilityState(),
         false);
   }
 }
 
 }  // namespace prerender