video : add video debug output to video.log

Change-Id: I266b8519aceba214803789a6b1f23876a974a1f8
Tuleap: #1226
diff --git a/VideoPage.xaml.cpp b/VideoPage.xaml.cpp
index 783f463..99a1a3c 100644
--- a/VideoPage.xaml.cpp
+++ b/VideoPage.xaml.cpp
@@ -73,12 +73,12 @@
                         previousTask.get();

                     }

                     catch (Platform::Exception^ e) {

-                        WriteLine( "Caught exception from previous task.\n" );

+                        RingDebug::instance->WriteLine( "Caught exception from previous task.\n" );

                     }

                 });

             }

             catch(Platform::COMException^ e) {

-                WriteLine(e->ToString());

+                RingDebug::instance->WriteLine(e->ToString());

             }

         }));

     });