From 0c2e1ab7dd0581cc3faa5379bc83467031269753 Mon Sep 17 00:00:00 2001
From: Kartikaya Gupta <kgupta@mozilla.com>
Date: Tue, 7 Apr 2015 16:53:41 -0400
Subject: [PATCH] Bug 1151890 - Explicitly set a null MessageLoop for the APZ
 controller thread on OS X. r=mstange

---
 widget/cocoa/nsChildView.h  | 1 +
 widget/cocoa/nsChildView.mm | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/widget/cocoa/nsChildView.h b/widget/cocoa/nsChildView.h
index 00838ac1e9ce..397513cd526c 100644
--- a/widget/cocoa/nsChildView.h
+++ b/widget/cocoa/nsChildView.h
@@ -560,6 +560,7 @@ protected:
   }
 
   void ConfigureAPZCTreeManager() override;
+  void ConfigureAPZControllerThread() override;
 
   void DoRemoteComposition(const nsIntRect& aRenderRect);
 
diff --git a/widget/cocoa/nsChildView.mm b/widget/cocoa/nsChildView.mm
index e9a5947893df..cdba8da06f30 100644
--- a/widget/cocoa/nsChildView.mm
+++ b/widget/cocoa/nsChildView.mm
@@ -60,6 +60,7 @@
 #include "ScopedGLHelpers.h"
 #include "HeapCopyOfStackArray.h"
 #include "mozilla/layers/APZCTreeManager.h"
+#include "mozilla/layers/APZThreadUtils.h"
 #include "mozilla/layers/GLManager.h"
 #include "mozilla/layers/CompositorOGL.h"
 #include "mozilla/layers/CompositorParent.h"
@@ -1890,6 +1891,14 @@ nsChildView::ConfigureAPZCTreeManager()
   gNumberOfWidgetsNeedingEventThread++;
 }
 
+void
+nsChildView::ConfigureAPZControllerThread()
+{
+  // On OS X the EventThreadRunner is the controller thread, but it doesn't
+  // have a MessageLoop.
+  APZThreadUtils::SetControllerThread(nullptr);
+}
+
 nsIntRect
 nsChildView::RectContainingTitlebarControls()
 {