(not for review yet)

cc/trees/layer_tree_host.h

 // Copyright 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 CC_TREES_LAYER_TREE_HOST_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <limits>
 #include <list>
 #include <vector>
@@ skipping 70 matching lines @@
   int max_texture_size;
   bool avoid_pow2_textures;
   bool using_map_image;
   bool using_shared_memory_resources;
 };
 
 struct CC_EXPORT UIResourceRequest {
   enum UIResourceRequestType {
     UIResourceCreate,
     UIResourceDelete,
+    UIResourceEvictionAck,
     UIResourceInvalidRequest
   };
 
   UIResourceRequest();
   ~UIResourceRequest();
   UIResourceRequestType type;
   UIResourceId id;
   scoped_refptr<UIResourceBitmap> bitmap;
+  uint64 ack;
 };
 
 class CC_EXPORT LayerTreeHost : NON_EXPORTED_BASE(public RateLimiterClient) {
  public:
   static scoped_ptr<LayerTreeHost> Create(
       LayerTreeHostClient* client,
       const LayerTreeSettings& settings,
       scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   virtual ~LayerTreeHost();
 
@@ skipping 167 matching lines @@
   // CreateUIResource creates a resource given a bitmap.  The bitmap is
   // generated via an interface function, which is called when initializing the
   // resource and when the resource has been lost (due to lost context).  The
   // parameter of the interface is a single boolean, which indicates whether the
   // resource has been lost or not.  CreateUIResource returns an Id of the
   // resource, which is always positive.
   virtual UIResourceId CreateUIResource(UIResourceClient* client);
   // Deletes a UI resource.  May safely be called more than once.
   virtual void DeleteUIResource(UIResourceId id);
 
+  // Record the eviction count sent by the LayerTreeHostImpl at BeginFrame.
+  // If |ui_resource_eviction_count| value is more recent than the current
+  // value of |ui_resource_eviction_count_last_acked_|, then add the recreation
+  // of all UI resources to the UIResourceRequestQueue.
+  void SetUIResourceEvictionCountToAck(uint64 ui_resource_eviction_count);
+
   bool UsingSharedMemoryResources();
   int id() const { return tree_id_; }
 
  protected:
   LayerTreeHost(LayerTreeHostClient* client, const LayerTreeSettings& settings);
   bool Initialize(scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
   bool InitializeForTesting(scoped_ptr<Proxy> proxy_for_testing);
 
  private:
   bool InitializeProxy(scoped_ptr<Proxy> proxy);
@@ skipping 24 matching lines @@
   bool AnimateLayersRecursive(Layer* current, base::TimeTicks time);
 
   void RecreateUIResources(bool resource_lost);
 
   typedef base::hash_map<UIResourceId, UIResourceClient*> UIResourceClientMap;
   UIResourceClientMap ui_resource_client_map_;
   int next_ui_resource_id_;
 
   typedef std::list<UIResourceRequest> UIResourceRequestQueue;
   UIResourceRequestQueue ui_resource_request_queue_;
+  uint64 ui_resource_eviction_count_last_acked_;
 
   void CalculateLCDTextMetricsCallback(Layer* layer);
 
   bool animating_;
   bool needs_full_tree_sync_;
   bool needs_filter_context_;
 
   base::CancelableClosure prepaint_callback_;
 
   LayerTreeHostClient* client_;
@@ skipping 69 matching lines @@
   };
   LCDTextMetrics lcd_text_metrics_;
   int tree_id_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_