Power save blocker: switch to new implementation.

content/browser/power_save_blocker_common.cc

-// Copyright (c) 2011 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 "content/browser/power_save_blocker.h"
-
-#include "base/bind.h"
-#include "content/public/browser/browser_thread.h"
-
-using content::BrowserThread;
-
-// Accessed only from the UI thread.
-int PowerSaveBlocker::blocker_count_[kPowerSaveBlockPreventStateCount];
-
-PowerSaveBlocker::PowerSaveBlocker(PowerSaveBlockerType type) : type_(type) {
-  DCHECK_LT(kPowerSaveBlockPreventNone, type);
-  DCHECK_GT(kPowerSaveBlockPreventStateCount, type);
-  std::vector<int> change(kPowerSaveBlockPreventStateCount);
-  ++change[type_];
-  PostAdjustBlockCount(change);
-}
-
-PowerSaveBlocker::~PowerSaveBlocker(void) {
-  std::vector<int> change(kPowerSaveBlockPreventStateCount);
-  --change[type_];
-  PostAdjustBlockCount(change);
-}
-
-// static
-void PowerSaveBlocker::PostAdjustBlockCount(const std::vector<int>& deltas) {
-  BrowserThread::PostTask(
-      BrowserThread::UI, FROM_HERE,
-      base::Bind(&PowerSaveBlocker::AdjustBlockCount, deltas));
-}
-
-// Called only from UI thread.
-// static
-void PowerSaveBlocker::AdjustBlockCount(const std::vector<int>& deltas) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-
-  PowerSaveBlockerType old_block = HighestBlockType();
-
-  for (size_t i = 0; i < deltas.size(); ++i)
-    blocker_count_[i] += deltas[i];
-
-  PowerSaveBlockerType new_block = HighestBlockType();
-
-  if (new_block != old_block)
-    ApplyBlock(new_block);
-}
-
-// Called only from UI thread.
-PowerSaveBlocker::PowerSaveBlockerType PowerSaveBlocker::HighestBlockType() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
-
-  for (PowerSaveBlockerType t = kPowerSaveBlockPreventDisplaySleep;
-       t >= kPowerSaveBlockPreventSystemSleep;
-       t = static_cast<PowerSaveBlockerType>(t - 1)) {
-    if (blocker_count_[t])
-      return t;
-  }
-
-  return kPowerSaveBlockPreventNone;
-}