Provide renderers with memory pressure signals.

content/browser/memory/memory_message_filter.h

 // Copyright 2015 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_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
 #define CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_
 
 #include "base/macros.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "content/common/content_export.h"
@@ skipping 18 matching lines @@
   void OnChannelClosing() override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
   void SendSetPressureNotificationsSuppressed(bool suppressed);
   void SendSimulatePressureNotification(
       base::MemoryPressureListener::MemoryPressureLevel level);
   void SendPressureNotification(
       base::MemoryPressureListener::MemoryPressureLevel level);
 
  protected:
-  friend class MemoryPressureController;
+  friend class MemoryPressureControllerImpl;
 
   ~MemoryMessageFilter() override;
 
   const void* process_host() const { return process_host_; }
   ProcessType process_type() const { return process_type_; }
 
  private:
   // The untyped process host and ProcessType associated with this filter
   // instance. The process host is stored as untyped because it is only used as
-  // a key in MemoryPressureController; at no point is it ever deferenced to
+  // a key in MemoryPressureControllerImpl; at no point is it ever deferenced to
   // invoke any members on a process host.
   const void* process_host_;
   ProcessType process_type_;
 
   DISALLOW_COPY_AND_ASSIGN(MemoryMessageFilter);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEMORY_MEMORY_MESSAGE_FILTER_H_