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

device/bluetooth/bluetooth_uuid.h

Index: device/bluetooth/bluetooth_uuid.h
diff --git a/device/bluetooth/bluetooth_uuid.h b/device/bluetooth/bluetooth_uuid.h
index 5c2fc8a3b9c0f05053baab9d0a773f0954c65ea7..0783bc7a4dfec7690cdda78e5f9cc6f325691158 100644
--- a/device/bluetooth/bluetooth_uuid.h
+++ b/device/bluetooth/bluetooth_uuid.h
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "device/bluetooth/bluetooth_export.h"
+
 namespace device {
 
 // Opaque wrapper around a Bluetooth UUID. Instances of UUID represent the
@@ -14,7 +16,7 @@ namespace device {
 // used in Bluetooth based communication, such as a peripheral's services,
 // characteristics, and characteristic descriptors. An instance are
 // constructed using a string representing 16, 32, or 128 bit UUID formats.
-class BluetoothUUID {
+class BLUETOOTH_EXPORT BluetoothUUID {
  public:
   // Possible representation formats used during construction.
   enum Format {
@@ -90,7 +92,7 @@ class BluetoothUUID {
 };
 
 // This is required by gtest to print a readable output on test failures.
-void PrintTo(const BluetoothUUID& uuid, std::ostream* out);
+void BLUETOOTH_EXPORT PrintTo(const BluetoothUUID& uuid, std::ostream* out);
 
 }  // namespace device