Reland of 'Move content/browser/power_save_blocker to //device/power_save_blocker'

content/browser/power_save_blocker_win.cc

Index: content/browser/power_save_blocker_win.cc
diff --git a/content/browser/power_save_blocker_win.cc b/content/browser/power_save_blocker_win.cc
deleted file mode 100644
index e9650a5cc1f634eb827387d6828e81444e0c5fcb..0000000000000000000000000000000000000000
--- a/content/browser/power_save_blocker_win.cc
+++ /dev/null
@@ -1,160 +0,0 @@
-// 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 <windows.h>
-
-#include "base/bind.h"
-#include "base/logging.h"
-#include "base/macros.h"
-#include "base/strings/utf_string_conversions.h"
-#include "base/win/scoped_handle.h"
-#include "base/win/windows_version.h"
-#include "content/browser/power_save_blocker_impl.h"
-
-namespace content {
-namespace {
-
-int g_blocker_count[2];
-
-HANDLE CreatePowerRequest(POWER_REQUEST_TYPE type,
-                          const std::string& description) {
-  if (type == PowerRequestExecutionRequired &&
-      base::win::GetVersion() < base::win::VERSION_WIN8) {
-    return INVALID_HANDLE_VALUE;
-  }
-
-  base::string16 wide_description = base::ASCIIToUTF16(description);
-  REASON_CONTEXT context = {0};
-  context.Version = POWER_REQUEST_CONTEXT_VERSION;
-  context.Flags = POWER_REQUEST_CONTEXT_SIMPLE_STRING;
-  context.Reason.SimpleReasonString =
-      const_cast<wchar_t*>(wide_description.c_str());
-
-  base::win::ScopedHandle handle(::PowerCreateRequest(&context));
-  if (!handle.IsValid())
-    return INVALID_HANDLE_VALUE;
-
-  if (::PowerSetRequest(handle.Get(), type))
-    return handle.Take();
-
-  // Something went wrong.
-  return INVALID_HANDLE_VALUE;
-}
-
-// Takes ownership of the |handle|.
-void DeletePowerRequest(POWER_REQUEST_TYPE type, HANDLE handle) {
-  base::win::ScopedHandle request_handle(handle);
-  if (!request_handle.IsValid())
-    return;
-
-  if (type == PowerRequestExecutionRequired &&
-      base::win::GetVersion() < base::win::VERSION_WIN8) {
-    return;
-  }
-
-  BOOL success = ::PowerClearRequest(request_handle.Get(), type);
-  DCHECK(success);
-}
-
-void ApplySimpleBlock(PowerSaveBlocker::PowerSaveBlockerType type,
-                      int delta) {
-  g_blocker_count[type] += delta;
-  DCHECK_GE(g_blocker_count[type], 0);
-
-  if (g_blocker_count[type] > 1)
-    return;
-
-  DWORD this_flag = 0;
-  if (type == PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension)
-    this_flag |= ES_SYSTEM_REQUIRED;
-  else
-    this_flag |= ES_DISPLAY_REQUIRED;
-
-  DCHECK(this_flag);
-
-  static DWORD flags = ES_CONTINUOUS;
-  if (!g_blocker_count[type])
-    flags &= ~this_flag;
-  else
-    flags |= this_flag;
-
-  SetThreadExecutionState(flags);
-}
-
-}  // namespace
-
-class PowerSaveBlockerImpl::Delegate
-    : public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
- public:
-  Delegate(PowerSaveBlockerType type,
-           const std::string& description,
-           scoped_refptr<base::SequencedTaskRunner> ui_task_runner)
-      : type_(type),
-        description_(description),
-        ui_task_runner_(ui_task_runner) {}
-
-  // Does the actual work to apply or remove the desired power save block.
-  void ApplyBlock();
-  void RemoveBlock();
-
-  // Returns the equivalent POWER_REQUEST_TYPE for this request.
-  POWER_REQUEST_TYPE RequestType();
-
- private:
-  friend class base::RefCountedThreadSafe<Delegate>;
-  ~Delegate() {}
-
-  PowerSaveBlockerType type_;
-  const std::string description_;
-  base::win::ScopedHandle handle_;
-  scoped_refptr<base::SequencedTaskRunner> ui_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(Delegate);
-};
-
-void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
-  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
-  if (base::win::GetVersion() < base::win::VERSION_WIN7)
-    return ApplySimpleBlock(type_, 1);
-
-  handle_.Set(CreatePowerRequest(RequestType(), description_));
-}
-
-void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
-  DCHECK(ui_task_runner_->RunsTasksOnCurrentThread());
-  if (base::win::GetVersion() < base::win::VERSION_WIN7)
-    return ApplySimpleBlock(type_, -1);
-
-  DeletePowerRequest(RequestType(), handle_.Take());
-}
-
-POWER_REQUEST_TYPE PowerSaveBlockerImpl::Delegate::RequestType() {
-  if (type_ == kPowerSaveBlockPreventDisplaySleep)
-    return PowerRequestDisplayRequired;
-
-  if (base::win::GetVersion() < base::win::VERSION_WIN8)
-    return PowerRequestSystemRequired;
-
-  return PowerRequestExecutionRequired;
-}
-
-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_(ui_task_runner),
-      blocking_task_runner_(blocking_task_runner) {
-  ui_task_runner_->PostTask(FROM_HERE,
-                            base::Bind(&Delegate::ApplyBlock, delegate_));
-}
-
-PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
-  ui_task_runner_->PostTask(FROM_HERE,
-                            base::Bind(&Delegate::RemoveBlock, delegate_));
-}
-
-}  // namespace content