Buffer cross frame paint timing updates.

chrome/browser/page_load_metrics/page_load_metrics_initialize.cc

 // Copyright 2015 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/page_load_metrics/page_load_metrics_initialize.h"
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
+#include "base/timer/timer.h"
 #include "chrome/browser/page_load_metrics/metrics_web_contents_observer.h"
 #if defined(OS_ANDROID)
 #include "chrome/browser/page_load_metrics/observers/android_page_load_metrics_observer.h"
 #endif  // OS_ANDROID
 #include "chrome/browser/page_load_metrics/observers/aborts_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/ads_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/amp_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/core_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/css_scanning_page_load_metrics_observer.h"
 #include "chrome/browser/page_load_metrics/observers/data_reduction_proxy_metrics_observer.h"
@@ skipping 29 matching lines @@
 
 class PageLoadMetricsEmbedder
     : public page_load_metrics::PageLoadMetricsEmbedderInterface {
  public:
   explicit PageLoadMetricsEmbedder(content::WebContents* web_contents);
   ~PageLoadMetricsEmbedder() override;
 
   // page_load_metrics::PageLoadMetricsEmbedderInterface:
   bool IsNewTabPageUrl(const GURL& url) override;
   void RegisterObservers(page_load_metrics::PageLoadTracker* tracker) override;
+  std::unique_ptr<base::Timer> CreateTimer() override;
 
  private:
   bool IsPrerendering() const;
 
   content::WebContents* const web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(PageLoadMetricsEmbedder);
 };
 
 PageLoadMetricsEmbedder::PageLoadMetricsEmbedder(
@@ skipping 67 matching lines @@
       base::MakeUnique<OmniboxSuggestionUsedMetricsObserver>(IsPrerendering()));
   tracker->AddObserver(
       base::MakeUnique<DelayNavigationPageLoadMetricsObserver>());
 }
 
 bool PageLoadMetricsEmbedder::IsPrerendering() const {
   return prerender::PrerenderContents::FromWebContents(web_contents_) !=
          nullptr;
 }
 
+std::unique_ptr<base::Timer> PageLoadMetricsEmbedder::CreateTimer() {
+  return base::MakeUnique<base::OneShotTimer>();
+}
+
 bool PageLoadMetricsEmbedder::IsNewTabPageUrl(const GURL& url) {
   Profile* profile =
       Profile::FromBrowserContext(web_contents_->GetBrowserContext());
   if (!profile)
     return false;
   return search::IsInstantNTPURL(url, profile);
 }
 
 }  // namespace
 
 void InitializePageLoadMetricsForWebContents(
     content::WebContents* web_contents,
     const base::Optional<content::WebContents::CreateParams>& create_params) {
   page_load_metrics::MetricsWebContentsObserver::CreateForWebContents(
       web_contents, create_params,
       base::MakeUnique<PageLoadMetricsEmbedder>(web_contents));
 }
 
 }  // namespace chrome