Don't require paint resampling for desktop APZ, yet. (bug 1126045 part 1, r=mattwoodrow)

--HG--
extra : rebase_source : c942d32bc9570d1ba9375e9c8289dc7aefceaea3

gfx/layers/client/ClientLayerManager.cpp

@@ -207,11 +207,16 @@ ClientLayerManager::BeginTransactionWithTarget(gfxContext* aTarget)
   // composited (including resampling) asynchronously before we get
   // a chance to repaint, so we have to ensure that it's all valid
   // and not rotated.
+  //
+  // Desktop does not support async zoom yet, so we ignore this for those
+  // platforms.
+#if defined(MOZ_WIDGET_ANDROID) || defined(MOZ_WIDGET_GONK)
   if (mWidget) {
     if (dom::TabChild* window = mWidget->GetOwningTabChild()) {
       mCompositorMightResample = window->IsAsyncPanZoomEnabled();
     }
   }
+#endif
 
   // If we have a non-default target, we need to let our shadow manager draw
   // to it. This will happen at the end of the transaction.