Make memory pressure notifier configurable

chromecast/browser/cast_memory_pressure_monitor.cc

 // 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.
 
 #include "chromecast/browser/cast_memory_pressure_monitor.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 93 matching lines @@
 
   base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
       FROM_HERE, base::Bind(&CastMemoryPressureMonitor::PollPressureLevel,
                             weak_ptr_factory_.GetWeakPtr()),
       base::TimeDelta::FromMilliseconds(kPollingIntervalMS));
 }
 
 void CastMemoryPressureMonitor::UpdateMemoryPressureLevel(
     MemoryPressureLevel new_level) {
   if (new_level != base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE)
-    base::MemoryPressureListener::NotifyMemoryPressure(new_level);
+    dispatch_callback_(new_level);
 
   if (new_level == current_level_)
     return;
 
   current_level_ = new_level;
   metrics::CastMetricsHelper::GetInstance()->RecordApplicationEventWithValue(
       "Memory.Pressure.LevelChange", new_level);
 }
 
+void MemoryPressureMonitor::SetDispatchCallback(DispatchCallback callback) {
+  dispatch_callback_ = callback;
+}
+
 }  // namespace chromecast