Move webCacheManager to //components.

chrome/browser/renderer_host/web_cache_manager.h

Index: chrome/browser/renderer_host/web_cache_manager.h
diff --git a/chrome/browser/renderer_host/web_cache_manager.h b/chrome/browser/renderer_host/web_cache_manager.h
deleted file mode 100644
index b7a59091b9d9002a7f5034ebe32390d29134741b..0000000000000000000000000000000000000000
--- a/chrome/browser/renderer_host/web_cache_manager.h
+++ /dev/null
@@ -1,222 +0,0 @@
-// 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.
-
-// This is the browser side of the cache manager, it tracks the activity of the
-// render processes and allocates available memory cache resources.
-
-#ifndef CHROME_BROWSER_RENDERER_HOST_WEB_CACHE_MANAGER_H_
-#define CHROME_BROWSER_RENDERER_HOST_WEB_CACHE_MANAGER_H_
-
-#include <list>
-#include <map>
-#include <set>
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "base/gtest_prod_util.h"
-#include "base/memory/weak_ptr.h"
-#include "base/time/time.h"
-#include "content/public/browser/notification_observer.h"
-#include "content/public/browser/notification_registrar.h"
-#include "third_party/WebKit/public/web/WebCache.h"
-
-template<typename Type>
-struct DefaultSingletonTraits;
-class PrefRegistrySimple;
-
-class WebCacheManager : public content::NotificationObserver {
-  friend class WebCacheManagerTest;
-  FRIEND_TEST_ALL_PREFIXES(WebCacheManagerBrowserTest, CrashOnceOnly);
-
- public:
-  static void RegisterPrefs(PrefRegistrySimple* registry);
-
-  // Gets the singleton WebCacheManager object.  The first time this method
-  // is called, a WebCacheManager object is constructed and returned.
-  // Subsequent calls will return the same object.
-  static WebCacheManager* GetInstance();
-
-  // When a render process is created, it registers itself with the cache
-  // manager host, causing the renderer to be allocated cache resources.
-  void Add(int renderer_id);
-
-  // When a render process ends, it removes itself from the cache manager host,
-  // freeing the manager to assign its cache resources to other renderers.
-  void Remove(int renderer_id);
-
-  // The cache manager assigns more cache resources to active renderer.  When a
-  // renderer is active, it should inform the cache manager to receive more
-  // cache resources.
-  //
-  // When a renderer moves from being inactive to being active, the cache
-  // manager may decide to adjust its resource allocation, but it will delay
-  // the recalculation, allowing ObserveActivity to return quickly.
-  void ObserveActivity(int renderer_id);
-
-  // Periodically, renderers should inform the cache manager of their current
-  // statistics.  The more up-to-date the cache manager's statistics, the
-  // better it can allocate cache resources.
-  void ObserveStats(
-      int renderer_id, const blink::WebCache::UsageStats& stats);
-
-  // The global limit on the number of bytes in all the in-memory caches.
-  size_t global_size_limit() const { return global_size_limit_; }
-
-  // Sets the global size limit, forcing a recalculation of cache allocations.
-  void SetGlobalSizeLimit(size_t bytes);
-
-  // Clears all in-memory caches.
-  void ClearCache();
-
-  // Clears all in-memory caches when a tab is reloaded or the user navigates
-  // to a different website.
-  void ClearCacheOnNavigation();
-
-  // content::NotificationObserver implementation:
-  virtual void Observe(int type,
-                       const content::NotificationSource& source,
-                       const content::NotificationDetails& details) OVERRIDE;
-
-  // Gets the default global size limit.  This interrogates system metrics to
-  // tune the default size to the current system.
-  static size_t GetDefaultGlobalSizeLimit();
-
- protected:
-  // The amount of idle time before we consider a tab to be "inactive"
-  static const int kRendererInactiveThresholdMinutes = 5;
-
-  // Keep track of some renderer information.
-  struct RendererInfo : blink::WebCache::UsageStats {
-    // The access time for this renderer.
-    base::Time access;
-  };
-
-  typedef std::map<int, RendererInfo> StatsMap;
-
-  // An allocation is the number of bytes a specific renderer should use for
-  // its cache.
-  typedef std::pair<int,size_t> Allocation;
-
-  // An allocation strategy is a list of allocations specifying the resources
-  // each renderer is permitted to consume for its cache.
-  typedef std::list<Allocation> AllocationStrategy;
-
-  // This class is a singleton.  Do not instantiate directly.
-  WebCacheManager();
-  friend struct DefaultSingletonTraits<WebCacheManager>;
-
-  virtual ~WebCacheManager();
-
-  // Recomputes the allocation of cache resources among the renderers.  Also
-  // informs the renderers of their new allocation.
-  void ReviseAllocationStrategy();
-
-  // Schedules a call to ReviseAllocationStrategy after a short delay.
-  void ReviseAllocationStrategyLater();
-
-  // The various tactics used as part of an allocation strategy.  To decide
-  // how many resources a given renderer should be allocated, we consider its
-  // usage statistics.  Each tactic specifies the function that maps usage
-  // statistics to resource allocations.
-  //
-  // Determining a resource allocation strategy amounts to picking a tactic
-  // for each renderer and checking that the total memory required fits within
-  // our |global_size_limit_|.
-  enum AllocationTactic {
-    // Ignore cache statistics and divide resources equally among the given
-    // set of caches.
-    DIVIDE_EVENLY,
-
-    // Allow each renderer to keep its current set of cached resources, with
-    // some extra allocation to store new objects.
-    KEEP_CURRENT_WITH_HEADROOM,
-
-    // Allow each renderer to keep its current set of cached resources.
-    KEEP_CURRENT,
-
-    // Allow each renderer to keep cache resources it believes are currently
-    // being used, with some extra allocation to store new objects.
-    KEEP_LIVE_WITH_HEADROOM,
-
-    // Allow each renderer to keep cache resources it believes are currently
-    // being used, but instruct the renderer to discard all other data.
-    KEEP_LIVE,
-  };
-
-  // Helper functions for devising an allocation strategy
-
-  // Add up all the stats from the given set of renderers and place the result
-  // in |stats|.
-  void GatherStats(const std::set<int>& renderers,
-                   blink::WebCache::UsageStats* stats);
-
-  // Get the amount of memory that would be required to implement |tactic|
-  // using the specified allocation tactic.  This function defines the
-  // semantics for each of the tactics.
-  static size_t GetSize(AllocationTactic tactic,
-                        const blink::WebCache::UsageStats& stats);
-
-  // Attempt to use the specified tactics to compute an allocation strategy
-  // and place the result in |strategy|.  |active_stats| and |inactive_stats|
-  // are the aggregate statistics for |active_renderers_| and
-  // |inactive_renderers_|, respectively.
-  //
-  // Returns |true| on success and |false| on failure.  Does not modify
-  // |strategy| on failure.
-  bool AttemptTactic(AllocationTactic active_tactic,
-                     const blink::WebCache::UsageStats& active_stats,
-                     AllocationTactic inactive_tactic,
-                     const blink::WebCache::UsageStats& inactive_stats,
-                     AllocationStrategy* strategy);
-
-  // For each renderer in |renderers|, computes its allocation according to
-  // |tactic| and add the result to |strategy|.  Any |extra_bytes_to_allocate|
-  // is divided evenly among the renderers.
-  void AddToStrategy(const std::set<int>& renderers,
-                     AllocationTactic tactic,
-                     size_t extra_bytes_to_allocate,
-                     AllocationStrategy* strategy);
-
-  // Enact an allocation strategy by informing the renderers of their
-  // allocations according to |strategy|.
-  void EnactStrategy(const AllocationStrategy& strategy);
-
-  enum ClearCacheOccasion {
-    // Instructs to clear the cache instantly.
-    INSTANTLY,
-    // Instructs to clear the cache when a navigation takes place (this
-    // includes reloading a tab).
-    ON_NAVIGATION
-  };
-
-  // Inform all |renderers| to clear their cache.
-  void ClearRendererCache(const std::set<int>& renderers,
-                          ClearCacheOccasion occation);
-
-  // Check to see if any active renderers have fallen inactive.
-  void FindInactiveRenderers();
-
-  // The global size limit for all in-memory caches.
-  size_t global_size_limit_;
-
-  // Maps every renderer_id our most recent copy of its statistics.
-  StatsMap stats_;
-
-  // Every renderer we think is still around is in one of these two sets.
-  //
-  // Active renderers are those renderers that have been active more recently
-  // than they have been inactive.
-  std::set<int> active_renderers_;
-  // Inactive renderers are those renderers that have been inactive more
-  // recently than they have been active.
-  std::set<int> inactive_renderers_;
-
-  base::WeakPtrFactory<WebCacheManager> weak_factory_;
-
-  content::NotificationRegistrar registrar_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebCacheManager);
-};
-
-#endif  // CHROME_BROWSER_RENDERER_HOST_WEB_CACHE_MANAGER_H_