Bug 1426351 - WindowSurfaceWayland - delete WaylandDisplay owned by compositor thread at compositor thread, r=jhorak

MozReview-Commit-ID: 6jtdXuiTj1F

--HG--
extra : rebase_source : cc072ac276956e2f8299dcfef3934dc16dbfbeda

widget/gtk/WindowSurfaceWayland.cpp

@@ -556,6 +556,7 @@ WindowSurfaceWayland::WindowSurfaceWayland(nsWindow *aWindow)
   , mBackBuffer(nullptr)
   , mFrameCallback(nullptr)
   , mFrameCallbackSurface(nullptr)
+  , mDisplayThreadMessageLoop(MessageLoop::current())
   , mDelayedCommit(false)
   , mFullScreenDamage(false)
   , mIsMainThread(NS_IsMainThread())
@@ -574,8 +575,8 @@ WindowSurfaceWayland::~WindowSurfaceWayland()
   if (!mIsMainThread) {
     // We can be destroyed from main thread even though we was created/used
     // in compositor thread. We have to unref/delete WaylandDisplay in compositor
-    // thread then.
+    // thread then and we can't use MessageLoop::current() here.
-    MessageLoop::current()->PostTask(
+    mDisplayThreadMessageLoop->PostTask(
       NewRunnableFunction(&WaylandDisplayRelease, mWaylandDisplay->GetDisplay()));
   } else {
     WaylandDisplayRelease(mWaylandDisplay->GetDisplay());

widget/gtk/WindowSurfaceWayland.h

@@ -121,6 +121,7 @@ private:
   WindowBackBuffer*         mBackBuffer;
   wl_callback*              mFrameCallback;
   wl_surface*               mFrameCallbackSurface;
+  MessageLoop*              mDisplayThreadMessageLoop;
   bool                      mDelayedCommit;
   bool                      mFullScreenDamage;
   bool                      mIsMainThread;