Implement BluetoothLowEnergyWrapperFake for Bluetooth test fixture

device/bluetooth/bluetooth_task_manager_win.cc

Index: device/bluetooth/bluetooth_task_manager_win.cc
diff --git a/device/bluetooth/bluetooth_task_manager_win.cc b/device/bluetooth/bluetooth_task_manager_win.cc
index a996cf348c2d28082b6f88057ff06e1f717a5e3f..8d9f6862a82917eed6e2d2e7ad3eb92e89fbc10a 100644
--- a/device/bluetooth/bluetooth_task_manager_win.cc
+++ b/device/bluetooth/bluetooth_task_manager_win.cc
@@ -443,7 +443,7 @@ bool BluetoothTaskManagerWin::SearchClassicDevices(
       win::BluetoothClassicWrapper::GetInstance()->FindFirstDevice(
           &device_search_params, &device_info);
   if (!handle) {
-    int last_error = GetLastError();
+    int last_error = win::BluetoothClassicWrapper::GetInstance()->LastError();

[scheib, 2016/02/07 02:24:08]

BTW, looking at how often ::GetInstance is being called, consider renameing with
::Get() in a future refactor patch.

[gogerald1, 2016/02/08 19:23:51]

Acknowledged.

     if (last_error == ERROR_NO_MORE_ITEMS) {
       return true;  // No devices is not an error.
     }
@@ -461,7 +461,7 @@ bool BluetoothTaskManagerWin::SearchClassicDevices(
     device_info.dwSize = sizeof(BLUETOOTH_DEVICE_INFO);
     if (!win::BluetoothClassicWrapper::GetInstance()->FindNextDevice(
             handle, &device_info)) {
-      int last_error = GetLastError();
+      int last_error = win::BluetoothClassicWrapper::GetInstance()->LastError();
       if (last_error == ERROR_NO_MORE_ITEMS) {
         break;  // No more items is expected error when done enumerating.
       }
@@ -472,7 +472,8 @@ bool BluetoothTaskManagerWin::SearchClassicDevices(
   }
 
   if (!win::BluetoothClassicWrapper::GetInstance()->FindDeviceClose(handle)) {
-    LogPollingError("Error calling BluetoothFindDeviceClose", GetLastError());
+    LogPollingError("Error calling BluetoothFindDeviceClose",
+                    win::BluetoothClassicWrapper::GetInstance()->LastError());
     return false;
   }
   return true;