[Prerender] first contentful paint histograms.

chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc

Index: chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
diff --git a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
index fba85610333a4622eccb2bffa6837b946a745bd2..9a87792b8ad8032c1fc491d0db18d7bfbedf2933 100644
--- a/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
+++ b/chrome/browser/page_load_metrics/observers/page_load_metrics_observer_test_harness.cc
@@ -26,10 +26,6 @@ class TestPageLoadMetricsEmbedderInterface
       PageLoadMetricsObserverTestHarness* test)
       : test_(test) {}
 
-  bool IsPrerendering(content::WebContents* web_contents) override {

[pasko, 2016/11/17 19:52:16]

just wondering if this IsPrerendering refactoring in metrics would be faster to
review separately from the new FCP histograms. Up to you though.

[mattcary, 2016/11/18 09:21:11]

We can't get the FCP metrics with the IsPrerendering refactor, so may as well do
them both together.

-    return false;
-  }
-
   bool IsNewTabPageUrl(const GURL& url) override { return false; }
 
   // Forward the registration logic to the test class so that derived classes