bug 1270795 - do not generate any background items in glyph path generating process; r=jfkthame

MozReview-Commit-ID: GbhxyY93Vur

--HG--
extra : rebase_source : 2eb309017fe2dcc33424de81eecdf4405cd38334

layout/base/nsDisplayList.cpp

@@ -2406,6 +2406,10 @@ nsDisplayBackgroundImage::AppendBackgroundItemsToTop(nsDisplayListBuilder* aBuil
                                                      nsDisplayList* aList,
                                                      bool aAllowWillPaintBorderOptimization)
 {
+  if (aBuilder->IsForGenerateGlyphPath()) {
+    return true;
+  }
+
   nsStyleContext* bgSC = nullptr;
   const nsStyleBackground* bg = nullptr;
   nsRect bgRect = aBackgroundRect + aBuilder->ToReferenceFrame(aFrame);

layout/generic/nsFrame.cpp

@@ -1890,10 +1890,6 @@ nsFrame::DisplayBorderBackgroundOutline(nsDisplayListBuilder*   aBuilder,
     return;
   }
 
-  if (aBuilder->IsForGenerateGlyphPath()) {
-    return;
-  }
-
   nsCSSShadowArray* shadows = StyleEffects()->mBoxShadow;
   if (shadows && shadows->HasShadowWithInset(false)) {
     aLists.BorderBackground()->AppendNewToTop(new (aBuilder)