Bug 1317430 - Avoid a unnecessary copy by passing a const & in view/ r=njn

MozReview-Commit-ID: BAZITOmUMVg

--HG--
extra : rebase_source : cddf1f80e6a646384f82cf9d70f96eacd09d8efd

view/nsViewManager.cpp

@@ -732,7 +732,7 @@ void nsViewManager::WillPaintWindow(nsIWidget* aWidget)
 }
 
 bool nsViewManager::PaintWindow(nsIWidget* aWidget,
-                                LayoutDeviceIntRegion aRegion)
+                                const LayoutDeviceIntRegion& aRegion)
 {
   if (!aWidget || !mContext)
     return false;

view/nsViewManager.h

@@ -383,7 +383,7 @@ private:
   bool IsPaintingAllowed() { return RootViewManager()->mRefreshDisableCount == 0; }
 
   void WillPaintWindow(nsIWidget* aWidget);
-  bool PaintWindow(nsIWidget* aWidget, LayoutDeviceIntRegion aRegion);
+  bool PaintWindow(nsIWidget* aWidget, const LayoutDeviceIntRegion& aRegion);
   void DidPaintWindow();
 
   // Call this when you need to let the viewmanager know that it now has