Add sleep blocker for Mac.

BUG=34081
TEST=as in bug

Review URL: http://codereview.chromium.org/5360001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67267 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 36 insertions, 0 deletions

diff --git a/chrome/browser/power_save_blocker_mac.cc b/chrome/browser/power_save_blocker_mac.cc
new file mode 100644
index 0000000..12a40ec
--- /dev/null
+++ b/chrome/browser/power_save_blocker_mac.cc
@@ -0,0 +1,36 @@
+// Copyright (c) 2010 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 "chrome/browser/power_save_blocker.h"
+
+#include <IOKit/pwr_mgt/IOPMLib.h>
+
+#include "chrome/browser/browser_thread.h"
+
+// Run on the UI thread only.
+void PowerSaveBlocker::ApplyBlock(bool blocking) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  // Block just idle sleep; allow display sleep.
+  // See QA1340 <http://developer.apple.com/library/mac/#qa/qa2004/qa1340.html>
+  // for more details.
+
+  static IOPMAssertionID sleep_assertion = kIOPMNullAssertionID;
+  IOReturn result;
+  if (blocking) {
+    DCHECK_EQ(sleep_assertion, kIOPMNullAssertionID);
+    result = IOPMAssertionCreate(
+        kIOPMAssertionTypeNoIdleSleep,
+        kIOPMAssertionLevelOn,
+        &sleep_assertion);
+  } else {
+    DCHECK_NE(sleep_assertion, kIOPMNullAssertionID);
+    result = IOPMAssertionRelease(sleep_assertion);
+    sleep_assertion = kIOPMNullAssertionID;
+  }
+
+  if (result != kIOReturnSuccess) {
+    NOTREACHED();
+  }
+}