Create base::win::MemoryPressureMonitor class.

content/browser/browser_main_loop.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 CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_
 #define CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/timer/timer.h"
 #include "content/browser/browser_process_sub_thread.h"
 #include "content/public/browser/browser_main_runner.h"
 
 namespace base {
 class CommandLine;
 class FilePath;
 class HighResolutionTimerManager;
 class MessageLoop;
 class PowerMonitor;
 class SystemMonitor;
 #if defined(OS_CHROMEOS)
 class MemoryPressureMonitorChromeOS;
 #elif defined(OS_MACOSX)
 class MemoryPressureMonitorMac;
+#elif defined(OS_WIN)
+class MemoryPressureMonitorWin;
 #endif
 namespace trace_event {
 class TraceMemoryController;
 class TraceEventSystemStatsMonitor;
 }  // namespace trace_event
 }  // namespace base
 
 namespace media {
 class AudioManager;
 class MidiManager;
@@ skipping 140 matching lines @@
   scoped_ptr<DeviceMonitorMac> device_monitor_mac_;
 #endif
 #if defined(OS_ANDROID)
   // Android implementation of ScreenOrientationDelegate
   scoped_ptr<ScreenOrientationDelegate> screen_orientation_delegate_;
 #endif
 #if defined(OS_CHROMEOS)
   scoped_ptr<base::MemoryPressureMonitorChromeOS> memory_pressure_monitor_;
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
   scoped_ptr<base::MemoryPressureMonitorMac> memory_pressure_monitor_;
+#elif defined(OS_WIN)
+  scoped_ptr<base::MemoryPressureMonitorWin> memory_pressure_monitor_;

[grt (UTC plus 2), 2015/05/05 15:34:00]

can some/all of these be scoped_ptr<base::MemoryPressureMonitor>? if not, why
not? that's the whole point of implementing this thing in terms of an abstract
base class, no?

[chrisha, 2015/05/05 19:46:13]

Yeah, the Windows and Mac ones can be folded. The ChromeOS one has some extra
member functions that aren't in the base class.

 #endif
   // The startup task runner is created by CreateStartupTasks()
   scoped_ptr<StartupTaskRunner> startup_task_runner_;
 
   // Destroy parts_ before main_message_loop_ (required) and before other
   // classes constructed in content (but after main_thread_).
   scoped_ptr<BrowserMainParts> parts_;
 
   // Members initialized in |InitializeMainThread()| ---------------------------
   // This must get destroyed before other threads that are created in parts_.
@@ skipping 22 matching lines @@
 
   // This timer initiates trace file saving.
   base::OneShotTimer<BrowserMainLoop> startup_trace_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserMainLoop);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_MAIN_LOOP_H_