Remove limit on number of resources in cc

android_webview/browser/global_tile_manager.h

-// Copyright 2014 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 ANDROID_WEBVIEW_BROWSER_GLOBAL_TILE_MANAGER_H_
-#define ANDROID_WEBVIEW_BROWSER_GLOBAL_TILE_MANAGER_H_
-
-#include <list>
-#include "base/basictypes.h"
-#include "base/lazy_instance.h"
-#include "base/sequence_checker.h"
-#include "base/synchronization/lock.h"
-#include "content/public/browser/android/synchronous_compositor.h"
-
-namespace android_webview {
-
-class GlobalTileManagerClient;
-
-// A global tile manager that keeps track of the number of tile resources. Each
-// tile needs file descriptors (typically 2) and there is a soft limit of 1024
-// file descriptors per Android process. The GlobalTileManager does not keep
-// track of how many tiles each individual view is actually using. The purpose
-// of GlobalTileManager is to behave gracefully (as in not crashing) when the
-// embedder of webview creates a lot of webviews and draw them at the same time.
-class GlobalTileManager {
- private:
-  typedef std::list<GlobalTileManagerClient*> ListType;
-
- public:
-  typedef ListType::iterator Key;
-  static GlobalTileManager* GetInstance();
-
-  void SetTileLimit(size_t num_tiles_limit);
-
-  // Requests the |new_num_of_tiles| from the available global pool. Calls
-  // GlobalTileManagerClient.SetNumTiles after the manager determines how many
-  // tiles are available for the client. If the number of tiles left is not
-  // enough to satisfy the request, the manager will evict tiles allocated to
-  // other clients.
-  void RequestTiles(content::SynchronousCompositorMemoryPolicy new_policy,
-                    Key key);
-
-  Key PushBack(GlobalTileManagerClient* client);
-
-  // |key| must be already in manager. Move the tile manager client
-  // corresponding to |key| to most recent. This function should be called after
-  // RequestTiles.
-  void DidUse(Key key);
-
-  void Remove(Key key);
-
- private:
-  friend struct base::DefaultLazyInstanceTraits<GlobalTileManager>;
-  GlobalTileManager();
-  ~GlobalTileManager();
-
-  // Continues evicting the inactive views until freeing up at least amount of
-  // tiles specified by |desired_num_tiles| to draw a view specified by |key|,
-  // or until all inactive views have been evicted. Returns the amount of
-  // memory that was actually evicted. This function is called when a
-  // request cannot be satisfied.
-  size_t Evict(size_t desired_num_tiles, Key key);
-
-  // Check that the sum of all client's tiles is equal to
-  // total_allocated_tiles_.
-  bool IsConsistent() const;
-
-  size_t num_tiles_limit_;
-
-  size_t total_allocated_tiles_;
-  ListType mru_list_;
-  base::SequenceChecker sequence_checker_;
-
-  DISALLOW_COPY_AND_ASSIGN(GlobalTileManager);
-};
-
-}  // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_GLOBAL_TILE_MANAGER_H_