Add instrumentation to see how often a local predictor prerender could be

chrome/browser/prerender/prerender_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 #define CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_
 
 #include <list>
 #include <map>
 #include <string>
@@ skipping 292 matching lines @@
   // these methods to get times for comparison, so that the test framework can
   // mock advancing/retarding time.
   virtual base::Time GetCurrentTime() const;
   virtual base::TimeTicks GetCurrentTimeTicks() const;
 
   scoped_refptr<predictors::LoggedInPredictorTable>
   logged_in_predictor_table() {
     return logged_in_predictor_table_;
   }
 
+  PrerenderLocalPredictor* local_predictor() {
+    return local_predictor_.get();
+  }
+
  protected:
   class PrerenderData : public base::SupportsWeakPtr<PrerenderData> {
    public:
     struct OrderByExpiryTime;
 
     PrerenderData(PrerenderManager* manager,
                   PrerenderContents* contents,
                   base::TimeTicks expiry_time);
 
     ~PrerenderData();
@@ skipping 304 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(PrerenderManager);
 };
 
 PrerenderManager* FindPrerenderManagerUsingRenderProcessId(
     int render_process_id);
 
 }  // namespace prerender
 
 #endif  // CHROME_BROWSER_PRERENDER_PRERENDER_MANAGER_H_