Buffer cross frame paint timing updates.

chrome/browser/page_load_metrics/page_load_metrics_initialize.cc

Index: chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
diff --git a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
index ac444105c327d1a8bae30dbb0be3d2c869ec643b..2e4b9a439c781e7716c8bee67ef276a27c3be897 100644
--- a/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
+++ b/chrome/browser/page_load_metrics/page_load_metrics_initialize.cc
@@ -55,6 +55,7 @@ class PageLoadMetricsEmbedder
   // 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;
@@ -142,6 +143,10 @@ bool PageLoadMetricsEmbedder::IsPrerendering() const {
          nullptr;
 }
 
+std::unique_ptr<base::Timer> PageLoadMetricsEmbedder::CreateTimer() {

[Charlie Harrison, 2017/05/30 14:49:07]

#include base/timer

[Bryan McQuade, 2017/05/30 15:30:22]

done

+  return base::MakeUnique<base::OneShotTimer>();
+}
+
 bool PageLoadMetricsEmbedder::IsNewTabPageUrl(const GURL& url) {
   Profile* profile =
       Profile::FromBrowserContext(web_contents_->GetBrowserContext());