[Experiment] purge-and-suspend

cc/raster/staging_buffer_pool.h

 // Copyright 2016 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_RASTER_STAGING_BUFFER_POOL_H_
 #define CC_RASTER_STAGING_BUFFER_POOL_H_
 
 #include <stdint.h>
 
 #include <deque>
 #include <memory>
 #include <set>
 
 #include "base/macros.h"
+#include "base/memory/memory_pressure_listener.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "base/time/time.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "cc/output/context_provider.h"
 #include "cc/resources/resource_provider.h"
 
 namespace gpu {
 namespace gles2 {
 class GLES2Interface;
@@ skipping 46 matching lines @@
   void ReleaseStagingBuffer(std::unique_ptr<StagingBuffer> staging_buffer);
 
  private:
   void AddStagingBuffer(const StagingBuffer* staging_buffer,
                         ResourceFormat format);
   void RemoveStagingBuffer(const StagingBuffer* staging_buffer);
   void MarkStagingBufferAsFree(const StagingBuffer* staging_buffer);
   void MarkStagingBufferAsBusy(const StagingBuffer* staging_buffer);
 
   base::TimeTicks GetUsageTimeForLRUBuffer();
+  void OnMemoryPressure(
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
   void ScheduleReduceMemoryUsage();
   void ReduceMemoryUsage();
   void ReleaseBuffersNotUsedSince(base::TimeTicks time);
 
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat> StateAsValue()
       const;
   void StagingStateAsValueInto(
       base::trace_event::TracedValue* staging_state) const;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   ContextProvider* const worker_context_provider_;
   ResourceProvider* const resource_provider_;
   const bool use_partial_raster_;
+  std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
   mutable base::Lock lock_;
   // |lock_| must be acquired when accessing the following members.
   using StagingBufferSet = std::set<const StagingBuffer*>;
   StagingBufferSet buffers_;
   using StagingBufferDeque = std::deque<std::unique_ptr<StagingBuffer>>;
   StagingBufferDeque free_buffers_;
   StagingBufferDeque busy_buffers_;
   const int max_staging_buffer_usage_in_bytes_;
   int staging_buffer_usage_in_bytes_;
   int free_staging_buffer_usage_in_bytes_;
   const base::TimeDelta staging_buffer_expiration_delay_;
   bool reduce_memory_usage_pending_;
   base::Closure reduce_memory_usage_callback_;
 
   base::WeakPtrFactory<StagingBufferPool> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(StagingBufferPool);
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_STAGING_BUFFER_POOL_H_