Bug 1011685 - Call ipc InitUIThread from MetroAppShell Init. Follow up for bug 1009590. r=me

widget/windows/winrt/MetroAppShell.cpp

@@ -8,6 +8,7 @@
 #include "mozilla/AutoRestore.h"
 #include "mozilla/TimeStamp.h"
 #include "mozilla/widget/AudioSession.h"
+#include "mozilla/ipc/WindowsMessageLoop.h"
 
 #include "nsIObserverService.h"
 #include "nsIAppStartup.h"
@@ -73,6 +74,8 @@ MetroAppShell::Init()
   WNDCLASSW wc;
   HINSTANCE module = GetModuleHandle(nullptr);
 
+  mozilla::ipc::windows::InitUIThread();
+
   const char16_t *const kWindowClass = L"nsAppShell:EventWindowClass";
   if (!GetClassInfoW(module, kWindowClass, &wc)) {
     wc.style         = 0;