Revert of Remove about:srcdoc url conversion.

chrome/browser/prerender/prerender_tab_helper.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/prerender/prerender_tab_helper.h"
 
 #include "base/bind.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/time/time.h"
 #include "chrome/browser/prerender/prerender_histograms.h"
@@ skipping 86 matching lines @@
   }
 
   // Reset the PPLT metric.
   pplt_load_start_ = base::TimeTicks();
   actual_load_start_ = base::TimeTicks();
 }
 
 void PrerenderTabHelper::DidStartProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& validated_url,
-    bool is_error_page) {
+    bool is_error_page,
+    bool is_iframe_srcdoc) {
   if (render_frame_host->GetParent())
     return;
 
   // Record PPLT state for the beginning of a new navigation.
   pplt_load_start_ = GetTimeTicksFromPrerenderManager();
   actual_load_start_ = base::TimeTicks();
 
   if (next_load_is_control_prerender_) {
     DCHECK_EQ(NAVIGATION_TYPE_NORMAL, navigation_type_);
     navigation_type_ = NAVIGATION_TYPE_WOULD_HAVE_BEEN_PRERENDERED;
@@ skipping 69 matching lines @@
   prerender_manager->RecordPerceivedPageLoadTime(
       origin_, navigation_type_, perceived_page_load_time,
       fraction_plt_elapsed_at_swap_in, url_);
 
   // Reset state for the next navigation.
   navigation_type_ = NAVIGATION_TYPE_NORMAL;
   origin_ = ORIGIN_NONE;
 }
 
 }  // namespace prerender