Issue #2828 - Part 13: Exclude strong layers-related code from release builds

I'll be leaving this in here for future use. CSSWG hasn't defined how this will be exposed to CSSOM yet. The parser bits are also not yet implemented.

layout/style/RuleCascadeData.cpp

@@ -1622,7 +1622,9 @@ CascadeLayer::CascadeLayer(nsPresContext* aPresContext,
                            nsMediaQueryResultCacheKey& aCacheKey)
   : mPresContext(aPresContext)
   , mIsAnonymous(true)
+#ifdef DEBUG
   , mIsStrong(false)
+#endif
   , mRulesAdded(false)
 #ifdef DEBUG
   , mParent(aParent)
@@ -1655,7 +1657,9 @@ CascadeLayer::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
   // don't count them. Their ownership is managed by the rule processor
   // to which they are eventually attached (see nsCSSRuleProcessor).
   n += mPreLayers.ShallowSizeOfExcludingThis(aMallocSizeOf);
+#ifdef DEBUG
   n += mPostLayers.ShallowSizeOfExcludingThis(aMallocSizeOf);
+#endif
   n += mLayers.ShallowSizeOfExcludingThis(aMallocSizeOf);
   for (auto iter = mLayers.ConstIter(); !iter.Done(); iter.Next()) {
     // We don't own the CascadeLayer objects so we don't count them. We
@@ -1779,9 +1783,11 @@ CascadeLayer::EnumerateAllLayers(nsLayerEnumFunc aFunc, void* aData)
 
   (*aFunc)(this, aData);
 
+#ifdef DEBUG
   if (mPostLayers.Length() > 0) {
     for (CascadeLayer* post : mPostLayers) {
       post->EnumerateAllLayers(aFunc, aData);
     }
   }
+#endif
 }

layout/style/RuleCascadeData.h

@@ -341,7 +341,9 @@ struct CascadeLayer
   nsPresContext* mPresContext;
   nsString mName;
   bool mIsAnonymous;
+#ifdef DEBUG
   bool mIsStrong;
+#endif
   bool mRulesAdded;
 
   RuleCascadeData* mData;
@@ -357,7 +359,9 @@ struct CascadeLayer
   CascadeLayer* mParent;
 #endif
   nsTArray<CascadeLayer*> mPreLayers;
+#ifdef DEBUG
   nsTArray<CascadeLayer*> mPostLayers;
+#endif
   nsDataHashtable<nsStringHashKey, CascadeLayer*> mLayers;
 
   CascadeLayer* CreateNamedChildLayer(const nsTArray<nsString>& aPath);