[Clean up] Introduce a BLUETOOTH_EXPORT macro to control symbol visibility outside of //device/blue…

device/bluetooth/bluetooth_export.h

Index: device/bluetooth/bluetooth_export.h
diff --git a/device/bluetooth/bluetooth_export.h b/device/bluetooth/bluetooth_export.h
new file mode 100644
index 0000000000000000000000000000000000000000..e3887d2dbf627e06fb4545b32a27ee43d9918399
--- /dev/null
+++ b/device/bluetooth/bluetooth_export.h
@@ -0,0 +1,34 @@
+// Copyright 2014 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_BLUETOOTH_BLUETOOTH_EXPORT_H_
+#define DEVICE_BLUETOOTH_BLUETOOTH_EXPORT_H_
+
+#if defined(COMPONENT_BUILD)
+#if defined(WIN32)
+
+#if defined(BLUETOOTH_IMPLEMENTATION)
+#define BLUETOOTH_EXPORT __declspec(dllexport)
+#define BLUETOOTH_EXPORT_PRIVATE __declspec(dllexport)
+#else
+#define BLUETOOTH_EXPORT __declspec(dllimport)
+#define BLUETOOTH_EXPORT_PRIVATE __declspec(dllimport)
+#endif  // defined(BLUETOOTH_IMPLEMENTATION)
+
+#else  // defined(WIN32)
+#if defined(BLUETOOTH_IMPLEMENTATION)
+#define BLUETOOTH_EXPORT __attribute__((visibility("default")))
+#define BLUETOOTH_EXPORT_PRIVATE __attribute__((visibility("default")))
+#else
+#define BLUETOOTH_EXPORT
+#define BLUETOOTH_EXPORT_PRIVATE
+#endif  // defined(BLUETOOTH_IMPLEMENTATION)
+#endif
+
+#else  // defined(COMPONENT_BUILD)
+#define BLUETOOTH_EXPORT
+#define BLUETOOTH_EXPORT_PRIVATE
+#endif
+
+#endif  // DEVICE_BLUETOOTH_BLUETOOTH_EXPORT_H_