Add the UMA recording recall of URLRequests preconnected.

chrome/browser/net/connect_interceptor.h

 // Copyright (c) 2011 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_NET_CONNECT_INTERCEPTOR_H_
 #define CHROME_BROWSER_NET_CONNECT_INTERCEPTOR_H_
 
-#include "base/containers/mru_cache.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/scoped_ptr.h"
-#include "base/time.h"
+#include "chrome/browser/net/timed_cache.h"
 
 class GURL;
 
 namespace net {
 class URLRequest;
 }
 
 namespace chrome_browser_net {
 
 class Predictor;
 
 //------------------------------------------------------------------------------
 // An interceptor to monitor URLRequests so that we can do speculative DNS
 // resolution and/or speculative TCP preconnections.
 class ConnectInterceptor {
  public:
   // Construction includes registration as an URL.
   explicit ConnectInterceptor(Predictor* predictor);
   // Destruction includes unregistering.
   virtual ~ConnectInterceptor();
 
   // Learn about referrers, and optionally preconnect based on history.
   void WitnessURLRequest(net::URLRequest* request);
 
  private:
   // Provide access to local class TimedCache for testing.
   FRIEND_TEST_ALL_PREFIXES(ConnectInterceptorTest, TimedCacheRecall);
   FRIEND_TEST_ALL_PREFIXES(ConnectInterceptorTest, TimedCacheEviction);
 
-  // Define a LRU cache that recalls all navigations within the last N seconds.
-  // When we learn about subresources to possibly preconnect to, it would be a
-  // waste to preconnect when the original navigation was too long ago.  Any
-  // connected, but unused TCP/IP connection, will generally be reset by the
-  // server if it is not used quickly (i.e., GET or POST is sent).
-  class TimedCache {
-   public:
-    explicit TimedCache(const base::TimeDelta& max_duration);
-    ~TimedCache();
-
-    // Evicts any entries that have been in the FIFO "too long," and then checks
-    // to see if the given url is (still) in the FIFO cache.
-    bool WasRecentlySeen(const GURL& url);
-
-    // Adds the given url to the cache, where it will remain for max_duration_.
-    void SetRecentlySeen(const GURL& url);
-
-   private:
-    // Our cache will be keyed on a URL (actually, just a scheme/host/port).
-    // We will always track the time it was last added to the FIFO cache by
-    // remembering a TimeTicks value.
-    typedef base::MRUCache<GURL, base::TimeTicks> UrlMruTimedCache;
-    UrlMruTimedCache mru_cache_;
-
-    // The longest time an entry can persist in the cache, and still be found.
-    const base::TimeDelta max_duration_;
-
-    DISALLOW_COPY_AND_ASSIGN(TimedCache);
-  };
   TimedCache timed_cache_;
   Predictor* const predictor_;
 
   DISALLOW_COPY_AND_ASSIGN(ConnectInterceptor);
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_CONNECT_INTERCEPTOR_H_