Fix Bluetooth Classic device polling issue.

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 db2540b12e77ddf41d8132c8b1ab5a904e590c6a..3f72ed83c603b62205306228bca4ec11556e901b 100644
--- a/device/bluetooth/bluetooth_task_manager_win.cc
+++ b/device/bluetooth/bluetooth_task_manager_win.cc
@@ -537,6 +537,7 @@ bool BluetoothTaskManagerWin::DiscoverClassicDeviceServices(
     const GUID& protocol_uuid,
     bool search_cached_services_only,
     ScopedVector<ServiceRecordState>* service_record_states) {
+TryAgain:
   // Bluetooth and WSAQUERYSET for Service Inquiry. See http://goo.gl/2v9pyt.
   WSAQUERYSET sdp_query;
   ZeroMemory(&sdp_query, sizeof(sdp_query));
@@ -562,7 +563,16 @@ bool BluetoothTaskManagerWin::DiscoverClassicDeviceServices(
   HANDLE sdp_handle;
   if (ERROR_SUCCESS !=
       WSALookupServiceBegin(&sdp_query, control_flags, &sdp_handle)) {
-    LogPollingError("Error calling WSALookupServiceBegin", WSAGetLastError());
+    int last_error = WSAGetLastError();
+    // If the device is "offline", no services are returned when specifying
+    // "LUP_FLUSHCACHE". Try again without flushing the cache so that the list
+    // of previously known services is returned.
+    if (!search_cached_services_only &&
+        (last_error == WSASERVICE_NOT_FOUND || last_error == WSANO_DATA)) {
+      search_cached_services_only = true;
+      goto TryAgain;

[xiyuan, 2014/08/14 19:35:29]

Can we get rid of the "goto"?

[rpaquay, 2014/08/15 19:55:33]

Done.

+    }
+    LogPollingError("Error calling WSALookupServiceBegin", last_error);
     return false;
   }
   char sdp_buffer[kServiceDiscoveryResultBufferSize];