Revert of Move content/browser/power_save_blocker to //device/power_save_blocker

content/browser/power_save_blocker_mac.cc

+// 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.
+
+#include "content/browser/power_save_blocker_impl.h"
+
+#include <IOKit/pwr_mgt/IOPMLib.h>
+
+#include "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/mac/scoped_cftyperef.h"
+#include "base/strings/sys_string_conversions.h"
+#include "base/threading/platform_thread.h"
+#include "base/threading/thread.h"
+
+namespace content {
+namespace {
+
+// Power management cannot be done on the UI thread. IOPMAssertionCreate does a
+// synchronous MIG call to configd, so if it is called on the main thread the UI
+// is at the mercy of another process. See http://crbug.com/79559 and
+// http://www.opensource.apple.com/source/IOKitUser/IOKitUser-514.16.31/pwr_mgt.subproj/IOPMLibPrivate.c .
+struct PowerSaveBlockerLazyInstanceTraits {
+  static const bool kRegisterOnExit = false;
+#ifndef NDEBUG
+  static const bool kAllowedToAccessOnNonjoinableThread = true;
+#endif
+
+  static base::Thread* New(void* instance) {
+    base::Thread* thread = new (instance) base::Thread("PowerSaveBlocker");
+    thread->Start();
+    return thread;
+  }
+  static void Delete(base::Thread* instance) { }
+};
+base::LazyInstance<base::Thread, PowerSaveBlockerLazyInstanceTraits>
+    g_power_thread = LAZY_INSTANCE_INITIALIZER;
+
+}  // namespace
+
+class PowerSaveBlockerImpl::Delegate
+    : public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
+ public:
+  Delegate(PowerSaveBlockerType type, const std::string& description)
+      : type_(type),
+        description_(description),
+        assertion_(kIOPMNullAssertionID) {}
+
+  // Does the actual work to apply or remove the desired power save block.
+  void ApplyBlock();
+  void RemoveBlock();
+
+ private:
+  friend class base::RefCountedThreadSafe<Delegate>;
+  ~Delegate() {}
+  PowerSaveBlockerType type_;
+  std::string description_;
+  IOPMAssertionID assertion_;
+};
+
+void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
+  DCHECK_EQ(base::PlatformThread::CurrentId(),
+            g_power_thread.Pointer()->GetThreadId());
+
+  CFStringRef level = NULL;
+  // See QA1340 <http://developer.apple.com/library/mac/#qa/qa1340/> for more
+  // details.
+  switch (type_) {
+    case PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension:
+      level = kIOPMAssertionTypeNoIdleSleep;
+      break;
+    case PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep:
+      level = kIOPMAssertionTypeNoDisplaySleep;
+      break;
+    default:
+      NOTREACHED();
+      break;
+  }
+  if (level) {
+    base::ScopedCFTypeRef<CFStringRef> cf_description(
+        base::SysUTF8ToCFStringRef(description_));
+    IOReturn result = IOPMAssertionCreateWithName(level, kIOPMAssertionLevelOn,
+                                                  cf_description, &assertion_);
+    LOG_IF(ERROR, result != kIOReturnSuccess)
+        << "IOPMAssertionCreate: " << result;
+  }
+}
+
+void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
+  DCHECK_EQ(base::PlatformThread::CurrentId(),
+            g_power_thread.Pointer()->GetThreadId());
+
+  if (assertion_ != kIOPMNullAssertionID) {
+    IOReturn result = IOPMAssertionRelease(assertion_);
+    LOG_IF(ERROR, result != kIOReturnSuccess)
+        << "IOPMAssertionRelease: " << result;
+  }
+}
+
+PowerSaveBlockerImpl::PowerSaveBlockerImpl(
+    PowerSaveBlockerType type,
+    Reason reason,
+    const std::string& description,
+    scoped_refptr<base::SequencedTaskRunner> ui_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> blocking_task_runner)
+    : delegate_(new Delegate(type, description)),
+      ui_task_runner_(ui_task_runner),
+      blocking_task_runner_(blocking_task_runner) {
+  g_power_thread.Pointer()->message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&Delegate::ApplyBlock, delegate_));
+}
+
+PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
+  g_power_thread.Pointer()->message_loop()->PostTask(
+      FROM_HERE,
+      base::Bind(&Delegate::RemoveBlock, delegate_));
+}
+
+}  // namespace content