GLES ProgramCache listens to memory pressure

gpu/command_buffer/service/memory_program_cache.h

 // Copyright (c) 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 GPU_COMMAND_BUFFER_SERVICE_MEMORY_PROGRAM_CACHE_H_
 #define GPU_COMMAND_BUFFER_SERVICE_MEMORY_PROGRAM_CACHE_H_
 
 #include <stddef.h>
 
 #include <map>
 #include <memory>
 #include <string>
 
 #include "base/containers/hash_tables.h"
 #include "base/containers/mru_cache.h"
 #include "base/macros.h"
+#include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ref_counted.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/command_buffer/service/program_cache.h"
 
 namespace gpu {
 
 class GpuProcessActivityFlags;
 
 namespace gles2 {
 
@@ skipping 132 matching lines @@
     MemoryProgramCache* const program_cache_;
 
     DISALLOW_COPY_AND_ASSIGN(ProgramCacheValue);
   };
 
   friend class ProgramCacheValue;
 
   typedef base::MRUCache<std::string,
                          scoped_refptr<ProgramCacheValue> > ProgramMRUCache;
 
+  void HandleMemoryPressure(
+      base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
+
   const size_t max_size_bytes_;
   const bool disable_gpu_shader_disk_cache_;
   const bool disable_program_caching_for_transform_feedback_;
   size_t curr_size_bytes_;
   ProgramMRUCache store_;
   GpuProcessActivityFlags* activity_flags_;
 
+  base::MemoryPressureListener memory_pressure_listener_;
+
   DISALLOW_COPY_AND_ASSIGN(MemoryProgramCache);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_MEMORY_PROGRAM_CACHE_H_