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

device/power_save_blocker/power_save_blocker_export.h

Index: device/power_save_blocker/power_save_blocker_export.h
diff --git a/device/power_save_blocker/power_save_blocker_export.h b/device/power_save_blocker/power_save_blocker_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..171405f4c43af8863b8d7278674ff0ec456c4e2b
--- /dev/null
+++ b/device/power_save_blocker/power_save_blocker_export.h
@@ -0,0 +1,28 @@
+// Copyright 2016 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.
+
+#ifndef DEVICE_POWER_SAVE_BLOCKER_DEVICE_POWER_SAVE_BLOCKER_EXPORT_H_
+#define DEVICE_POWER_SAVE_BLOCKER_DEVICE_POWER_SAVE_BLOCKER_EXPORT_H_
+
+#if defined(COMPONENT_BUILD) && defined(WIN32)
+
+#if defined(DEVICE_POWER_SAVE_BLOCKER_IMPLEMENTATION)
+#define DEVICE_POWER_SAVE_BLOCKER_EXPORT __declspec(dllexport)
+#else
+#define DEVICE_POWER_SAVE_BLOCKER_EXPORT __declspec(dllimport)
+#endif
+
+#elif defined(COMPONENT_BUILD) && !defined(WIN32)
+
+#if defined(DEVICE_POWER_SAVE_BLOCKER_IMPLEMENTATION)
+#define DEVICE_POWER_SAVE_BLOCKER_EXPORT __attribute__((visibility("default")))
+#else
+#define DEVICE_POWER_SAVE_BLOCKER_EXPORT
+#endif
+
+#else
+#define DEVICE_POWER_SAVE_BLOCKER_EXPORT
+#endif
+
+#endif  // DEVICE_POWER_SAVE_BLOCKER_DEVICE_POWER_SAVE_BLOCKER_EXPORT_H_