[Experiment] purge-and-suspend

cc/resources/resource_pool.h

 // Copyright 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 CC_RESOURCES_RESOURCE_POOL_H_
 #define CC_RESOURCES_RESOURCE_POOL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <deque>
 #include <map>
 #include <memory>
 
 #include "base/macros.h"
+#include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "cc/base/cc_export.h"
 #include "cc/output/renderer.h"
 #include "cc/resources/resource.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/scoped_resource.h"
 
 namespace cc {
 
@@ skipping 94 matching lines @@
     gfx::Rect invalidated_rect_;
   };
 
   void DidFinishUsingResource(std::unique_ptr<PoolResource> resource);
   void DeleteResource(std::unique_ptr<PoolResource> resource);
   static void UpdateResourceContentIdAndInvalidation(
       PoolResource* resource,
       uint64_t new_content_id,
       const gfx::Rect& new_invalidated_rect);
 
+  void OnMemoryPressure(
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
+
   // Functions which manage periodic eviction of expired resources.
   void ScheduleEvictExpiredResourcesIn(base::TimeDelta time_from_now);
   void EvictExpiredResources();
   void EvictResourcesNotUsedSince(base::TimeTicks time_limit);
   bool HasEvictableResources() const;
   base::TimeTicks GetUsageTimeForLRUResource() const;
 
   ResourceProvider* resource_provider_;
   bool use_gpu_memory_buffers_;
   size_t max_memory_usage_bytes_;
   size_t max_resource_count_;
   size_t in_use_memory_usage_bytes_;
   size_t total_memory_usage_bytes_;
   size_t total_resource_count_;
 
   // Holds most recently used resources at the front of the queue.
   using ResourceDeque = std::deque<std::unique_ptr<PoolResource>>;
   ResourceDeque unused_resources_;
   ResourceDeque busy_resources_;
 
+  std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
+
   using InUseResourceMap = std::map<ResourceId, std::unique_ptr<PoolResource>>;
   InUseResourceMap in_use_resources_;
 
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   bool evict_expired_resources_pending_;
   base::TimeDelta resource_expiration_delay_;
 
   base::WeakPtrFactory<ResourcePool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourcePool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_RESOURCE_POOL_H_