Bug 965805 - Calling nsITabParent::InjectTouchEvent can results into an out of sync TabParent::mEventCaptureDepth. r=kats

dom/ipc/TabParent.cpp

@@ -1926,6 +1926,11 @@ TabParent::GetLoadContext()
   return loadContext.forget();
 }
 
+/* Be careful if you call this method while proceding a real touch event. For
+ * example sending a touchstart during a real touchend may results into
+ * a busted mEventCaptureDepth and following touch events may not do what you
+ * expect.
+ */
 NS_IMETHODIMP
 TabParent::InjectTouchEvent(const nsAString& aType,
                             uint32_t* aIdentifiers,
@@ -1969,6 +1974,11 @@ TabParent::InjectTouchEvent(const nsAString& aType,
     event.touches.AppendElement(t);
   }
 
+  if ((msg == NS_TOUCH_END || msg == NS_TOUCH_CANCEL) && sEventCapturer) {
+    WidgetGUIEvent* guiEvent = event.AsGUIEvent();
+    TryCapture(*guiEvent);
+  }
+
   SendRealTouchEvent(event);
   return NS_OK;
 }