[Mac] Report statistics more regularly in Mac memory pressure monitor

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 37 matching lines @@
       system_reserved_kb_(GetSystemReservedKb()),
       dispatch_callback_(
           base::Bind(&base::MemoryPressureListener::NotifyMemoryPressure)),
       weak_ptr_factory_(this) {
   PollPressureLevel();
 }
 
 CastMemoryPressureMonitor::~CastMemoryPressureMonitor() {}
 
 CastMemoryPressureMonitor::MemoryPressureLevel
-CastMemoryPressureMonitor::GetCurrentPressureLevel() const {
+CastMemoryPressureMonitor::GetCurrentPressureLevel() {
   return current_level_;
 }
 
 void CastMemoryPressureMonitor::PollPressureLevel() {
   MemoryPressureLevel level =
       base::MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE;
 
   base::SystemMemoryInfoKB info;
   if (!base::GetSystemMemoryInfo(&info)) {
     LOG(ERROR) << "GetSystemMemoryInfo failed";
@@ skipping 56 matching lines @@
   metrics::CastMetricsHelper::GetInstance()->RecordApplicationEventWithValue(
       "Memory.Pressure.LevelChange", new_level);
 }
 
 void CastMemoryPressureMonitor::SetDispatchCallback(
     const DispatchCallback& callback) {
   dispatch_callback_ = callback;
 }
 
 }  // namespace chromecast