Implemented BluetoothAdapterWin::IsPresent().

device/bluetooth/bluetooth_adapter_win.h

Index: device/bluetooth/bluetooth_adapter_win.h
diff --git a/device/bluetooth/bluetooth_adapter_win.h b/device/bluetooth/bluetooth_adapter_win.h
index de76b18e8eb7719b0994d5c782dd90685655601f..8e0cba7d77b546b90e91427ee18f3cbb00df3385 100644
--- a/device/bluetooth/bluetooth_adapter_win.h
+++ b/device/bluetooth/bluetooth_adapter_win.h
@@ -16,6 +16,7 @@ class BluetoothAdapterFactory;
 class BluetoothDevice;
 
 class BluetoothAdapterWin : public BluetoothAdapter {
+ public:
   // BluetoothAdapter override
   virtual void AddObserver(BluetoothAdapter::Observer* observer) OVERRIDE;
   virtual void RemoveObserver(BluetoothAdapter::Observer* observer) OVERRIDE;
@@ -44,6 +45,12 @@ class BluetoothAdapterWin : public BluetoothAdapter {
   BluetoothAdapterWin();
   virtual ~BluetoothAdapterWin();
 
+  // Obtains the default adapter info (the first bluetooth radio info) and
+  // tracks future changes to it.
+  void TrackDefaultAdapter();
+
+  void UpdateAdapterState();
+
   // NOTE: This should remain the last member so it'll be destroyed and
   // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<BluetoothAdapterWin> weak_ptr_factory_;