Add histograms for network activity, and total/cumulative

chrome/browser/net/cache_stats.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_NET_CACHE_STATS_H_
-#define CHROME_BROWSER_NET_CACHE_STATS_H_
-
-#include <map>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/hash_tables.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
-#include "base/time.h"
-#include "chrome/browser/net/chrome_url_request_context.h"
-#include "content/public/browser/web_contents_observer.h"
-#include "net/base/network_delegate.h"
-
-class TabContents;
-
-namespace base {
-class Histogram;
-}
-
-namespace net {
-class URLRequest;
-class URLRequestContext;
-}
-
-#if defined(COMPILER_GCC)
-
-namespace BASE_HASH_NAMESPACE {
-template <>
-struct hash<const net::URLRequestContext*> {
-  std::size_t operator()(const net::URLRequestContext* value) const {
-    return reinterpret_cast<std::size_t>(value);
-  }
-};
-}
-
-#endif
-
-namespace chrome_browser_net {
-
-// This class collects UMA stats about cache performance.
-class CacheStats {
- public:
-  enum TabEvent {
-    SPINNER_START,
-    SPINNER_STOP
-  };
-  CacheStats();
-  ~CacheStats();
-
-  void OnCacheWaitStateChange(const net::URLRequest& request,
-                              net::NetworkDelegate::CacheWaitState state);
-  void OnTabEvent(std::pair<int, int> render_view_id, TabEvent event);
-  void RegisterURLRequestContext(const net::URLRequestContext* context,
-                                 ChromeURLRequestContext::ContextType type);
-  void UnregisterURLRequestContext(const net::URLRequestContext* context);
-
- private:
-  struct TabLoadStats;
-  // A map mapping a renderer's process id and route id to a TabLoadStats,
-  // representing that renderer's load statistics.
-  typedef std::map<std::pair<int, int>, TabLoadStats*> TabLoadStatsMap;
-
-  // Gets TabLoadStats for a given RenderView.
-  TabLoadStats* GetTabLoadStats(std::pair<int, int> render_view_id);
-  // Deletes TabLoadStats no longer needed for a render view.
-  void RemoveTabLoadStats(std::pair<int, int> render_view_id);
-  // Sets a timer for a given tab to collect stats.  |timer_index| indicates
-  // how many times stats have been collected since the navigation has started
-  // for this tab.
-  void ScheduleTimer(TabLoadStats* stats);
-  // The callback when a timer fires to collect stats again.
-  void TimerCallback(TabLoadStats* stats);
-  // Helper function to put the current set of cache statistics into an UMA
-  // histogram.
-  void RecordCacheFractionHistogram(base::TimeDelta elapsed,
-                                    base::TimeDelta cache_time,
-                                    bool is_load_done,
-                                    int timer_index);
-
-  TabLoadStatsMap tab_load_stats_;
-  std::vector<base::Histogram*> final_histograms_;
-  std::vector<base::Histogram*> intermediate_histograms_;
-  base::hash_set<const net::URLRequestContext*> main_request_contexts_;
-
-  DISALLOW_COPY_AND_ASSIGN(CacheStats);
-};
-
-// A WebContentsObserver watching all tabs, notifying CacheStats
-// whenever the spinner starts or stops for a given tab, and when a renderer
-// is no longer used.
-class CacheStatsTabHelper : public content::WebContentsObserver {
- public:
-  explicit CacheStatsTabHelper(TabContents* tab);
-  virtual ~CacheStatsTabHelper();
-
-  // content::WebContentsObserver implementation
-  virtual void DidStartProvisionalLoadForFrame(
-      int64 frame_id,
-      bool is_main_frame,
-      const GURL& validated_url,
-      bool is_error_page,
-      content::RenderViewHost* render_view_host) OVERRIDE;
-  virtual void DidStopLoading(
-      content::RenderViewHost* render_view_host) OVERRIDE;
-
- private:
-  // Calls into CacheStats to notify that a reportable event has occurred
-  // for the tab being observed.
-  void NotifyCacheStats(CacheStats::TabEvent event,
-                        content::RenderViewHost* render_view_host);
-
-  CacheStats* cache_stats_;
-  bool is_otr_profile_;
-
-  DISALLOW_COPY_AND_ASSIGN(CacheStatsTabHelper);
-};
-
-}  // namespace chrome_browser_net
-
-#endif  // CHROME_BROWSER_NET_CACHE_STATS_H_