Make HostDiscardableSharedMemoryManager a client of memory coordinator

content/common/host_discardable_shared_memory_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 CONTENT_COMMON_HOST_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
 #define CONTENT_COMMON_HOST_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/containers/hash_tables.h"
 #include "base/format_macros.h"
 #include "base/macros.h"
 #include "base/memory/discardable_memory_allocator.h"
 #include "base/memory/discardable_shared_memory.h"
+#include "base/memory/memory_coordinator_client.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/shared_memory.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process_handle.h"
 #include "base/synchronization/lock.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_provider.h"
 #include "content/common/content_export.h"
 
 namespace content {
 typedef int32_t DiscardableSharedMemoryId;
 
 // Implementation of DiscardableMemoryAllocator that allocates and manages
 // discardable memory segments for the browser process and child processes.
 // This class is thread-safe and instances can safely be used on any thread.
 class CONTENT_EXPORT HostDiscardableSharedMemoryManager
     : public base::DiscardableMemoryAllocator,
-      public base::trace_event::MemoryDumpProvider {
+      public base::trace_event::MemoryDumpProvider,
+      public base::MemoryCoordinatorClient {
  public:
   HostDiscardableSharedMemoryManager();
   ~HostDiscardableSharedMemoryManager() override;
 
   // Returns a singleton instance.
   static HostDiscardableSharedMemoryManager* current();
 
   // Overridden from base::DiscardableMemoryAllocator:
   std::unique_ptr<base::DiscardableMemory> AllocateLockedDiscardableMemory(
       size_t size) override;
@@ skipping 47 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(MemorySegment);
   };
 
   static bool CompareMemoryUsageTime(const scoped_refptr<MemorySegment>& a,
                                      const scoped_refptr<MemorySegment>& b) {
     // In this system, LRU memory segment is evicted first.
     return a->memory()->last_known_usage() > b->memory()->last_known_usage();
   }
 
+  // base::MemoryCoordinatorClient implementation:
+  void OnMemoryStateChange(base::MemoryState state) override;
+
   void AllocateLockedDiscardableSharedMemory(
       base::ProcessHandle process_handle,
       int client_process_id,
       size_t size,
       DiscardableSharedMemoryId id,
       base::SharedMemoryHandle* shared_memory_handle);
   void DeletedDiscardableSharedMemory(DiscardableSharedMemoryId id,
                                       int client_process_id);
   void OnMemoryPressure(
       base::MemoryPressureListener::MemoryPressureLevel memory_pressure_level);
@@ skipping 23 matching lines @@
   base::Closure enforce_memory_policy_callback_;
   bool enforce_memory_policy_pending_;
   base::WeakPtrFactory<HostDiscardableSharedMemoryManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(HostDiscardableSharedMemoryManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_HOST_DISCARDABLE_SHARED_MEMORY_MANAGER_H_