--- a/widget/cocoa/nsChildView.h
+++ b/widget/cocoa/nsChildView.h
@@ -415,16 +415,22 @@ public:
   virtual nsresult SynthesizeNativeMouseScrollEvent(LayoutDeviceIntPoint aPoint,
                                                     uint32_t aNativeMessage,
                                                     double aDeltaX,
                                                     double aDeltaY,
                                                     double aDeltaZ,
                                                     uint32_t aModifierFlags,
                                                     uint32_t aAdditionalFlags,
                                                     nsIObserver* aObserver) override;
+  virtual nsresult SynthesizeNativeTouchPoint(uint32_t aPointerId,
+                                              TouchPointerState aPointerState,
+                                              LayoutDeviceIntPoint aPoint,
+                                              double aPointerPressure,
+                                              uint32_t aPointerOrientation,
+                                              nsIObserver* aObserver) override;
 
   // Mac specific methods
   
   virtual bool      DispatchWindowEvent(mozilla::WidgetGUIEvent& event);
 
   void WillPaintWindow();
   bool PaintWindow(LayoutDeviceIntRegion aRegion);
   bool PaintWindowInContext(CGContextRef aContext, const LayoutDeviceIntRegion& aRegion,
@@ -642,11 +648,15 @@ protected:
   // flag tells us that we shouldn't allow the remaining events to cause
   // scrolling. It is reset to false once a new gesture starts (as indicated by
   // a PANGESTURE_(MAY)START event).
   bool mCurrentPanGestureBelongsToSwipe;
 
   static uint32_t sLastInputEventCount;
 
   void ReleaseTitlebarCGContext();
+
+  // This is used by SynthesizeNativeTouchPoint to maintain state between
+  // multiple synthesized points
+  mozilla::UniquePtr<mozilla::MultiTouchInput> mSynthesizedTouchInput;
 };
 
 #endif // nsChildView_h_

--- a/widget/cocoa/nsChildView.mm
+++ b/widget/cocoa/nsChildView.mm
@@ -1179,16 +1179,64 @@ nsresult nsChildView::SynthesizeNativeMo
 
   CGEventPost(kCGHIDEventTap, cgEvent);
   CFRelease(cgEvent);
   return NS_OK;
 
   NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
 }
 
+nsresult nsChildView::SynthesizeNativeTouchPoint(uint32_t aPointerId,
+                                                 TouchPointerState aPointerState,
+                                                 mozilla::LayoutDeviceIntPoint aPoint,
+                                                 double aPointerPressure,
+                                                 uint32_t aPointerOrientation,
+                                                 nsIObserver* aObserver)
+{
+  NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NSRESULT;
+
+  AutoObserverNotifier notifier(aObserver, "touchpoint");
+
+  MOZ_ASSERT(NS_IsMainThread());
+  if (aPointerState == TOUCH_HOVER) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  if (!mSynthesizedTouchInput) {
+    mSynthesizedTouchInput = MakeUnique<MultiTouchInput>();
+  }
+
+  LayoutDeviceIntPoint pointInWindow = aPoint - WidgetToScreenOffset();
+  MultiTouchInput inputToDispatch = UpdateSynthesizedTouchState(
+      mSynthesizedTouchInput.get(), aPointerId, aPointerState,
+      pointInWindow, aPointerPressure, aPointerOrientation);
+
+  if (mAPZC) {
+    uint64_t inputBlockId = 0;
+    ScrollableLayerGuid guid;
+
+    nsEventStatus result = mAPZC->ReceiveInputEvent(inputToDispatch, &guid, &inputBlockId);
+    if (result == nsEventStatus_eConsumeNoDefault) {
+      return NS_OK;
+    }
+
+    WidgetTouchEvent event = inputToDispatch.ToWidgetTouchEvent(this);
+    ProcessUntransformedAPZEvent(&event, guid, inputBlockId, result);
+  } else {
+    WidgetTouchEvent event = inputToDispatch.ToWidgetTouchEvent(this);
+
+    nsEventStatus status;
+    DispatchEvent(&event, status);
+  }
+
+  return NS_OK;;
+
+  NS_OBJC_END_TRY_ABORT_BLOCK_NSRESULT;
+}
+
 // First argument has to be an NSMenu representing the application's top-level
 // menu bar. The returned item is *not* retained.
 static NSMenuItem* NativeMenuItemWithLocation(NSMenu* menubar, NSString* locationString)
 {
   NSArray* indexes = [locationString componentsSeparatedByString:@"|"];
   unsigned int indexCount = [indexes count];
   if (indexCount == 0)
     return nil;