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

content/browser/power_save_blocker_win.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 <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