Experiment to disable Prerendering with fast wind-down

chrome/browser/prerender/prerender_manager.h

Index: chrome/browser/prerender/prerender_manager.h
diff --git a/chrome/browser/prerender/prerender_manager.h b/chrome/browser/prerender/prerender_manager.h
index f95472655d929f4a1d0efb6b92b3900b36c94b8c..427f97cc3b7653df450a8794aad76f205a47b7a0 100644
--- a/chrome/browser/prerender/prerender_manager.h
+++ b/chrome/browser/prerender/prerender_manager.h
@@ -321,6 +321,10 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   void SetPrerenderContentsFactoryForTest(
       PrerenderContents::Factory* prerender_contents_factory);
 
+  bool IsPrerenderSilenceExperimentForTesting(Origin origin) const {
+    return IsPrerenderSilenceExperiment(origin);
+  }
+
  protected:
   class PrerenderData : public base::SupportsWeakPtr<PrerenderData> {
    public:
@@ -406,6 +410,10 @@ class PrerenderManager : public base::SupportsWeakPtr<PrerenderManager>,
   // Time window for which we record old navigations, in milliseconds.
   static const int kNavigationRecordWindowMs = 5000;
 
+  // Returns whether adding new prerenders should be disabled because of the
+  // experiment running.
+  bool IsPrerenderSilenceExperiment(Origin origin) const;
+
   // Returns whether prerendering is currently enabled or the reason why it is
   // disabled.
   chrome_browser_net::NetworkPredictionStatus GetPredictionStatus() const;