Bug 964261 - Declare a widget to events created by TabParent::InjectTouchEvent. r=kats

dom/ipc/TabParent.cpp

@@ -1916,7 +1916,12 @@ TabParent::InjectTouchEvent(const nsAString& aType,
     return NS_ERROR_FAILURE;
   }
 
-  WidgetTouchEvent event(true, msg, nullptr);
+  nsCOMPtr<nsIWidget> widget = GetWidget();
+  if (!widget) {
+    return NS_ERROR_FAILURE;
+  }
+
+  WidgetTouchEvent event(true, msg, widget);
   event.modifiers = aModifiers;
   event.time = PR_IntervalNow();
 
@@ -1927,6 +1932,11 @@ TabParent::InjectTouchEvent(const nsAString& aType,
                                   nsIntPoint(aRxs[i], aRys[i]),
                                   aRotationAngles[i],
                                   aForces[i]);
+
+    // Consider all injected touch events as changedTouches. For more details
+    // about the meaning of changedTouches for each event, see
+    // https://developer.mozilla.org/docs/Web/API/TouchEvent.changedTouches
+    t->mChanged = true;
     event.touches.AppendElement(t);
   }