Bug 1166805 part 2 - Call SetCapacity before calling DOMSVGXXXList::MaybeInsertNullInAnimValListAt, to prevent fallible InsertElementAt calls from failing r=dholbert

dom/svg/DOMSVGLengthList.cpp

@@ -260,6 +260,13 @@ DOMSVGLengthList::InsertItemBefore(DOMSVGLength& newItem,
     error.Throw(NS_ERROR_OUT_OF_MEMORY);
     return nullptr;
   }
+  if (AnimListMirrorsBaseList()) {
+    if (!mAList->mAnimVal->mItems.SetCapacity(
+          mAList->mAnimVal->mItems.Length() + 1, fallible)) {
+      error.Throw(NS_ERROR_OUT_OF_MEMORY);
+      return nullptr;
+    }
+  }
 
   AutoChangeLengthListNotifier notifier(this);
   // Now that we know we're inserting, keep animVal list in sync as necessary.

dom/svg/DOMSVGNumberList.cpp

@@ -244,6 +244,13 @@ DOMSVGNumberList::InsertItemBefore(DOMSVGNumber& aItem,
     error.Throw(NS_ERROR_OUT_OF_MEMORY);
     return nullptr;
   }
+  if (AnimListMirrorsBaseList()) {
+    if (!mAList->mAnimVal->mItems.SetCapacity(
+          mAList->mAnimVal->mItems.Length() + 1, fallible)) {
+      error.Throw(NS_ERROR_OUT_OF_MEMORY);
+      return nullptr;
+    }
+  }
 
   AutoChangeNumberListNotifier notifier(this);
   // Now that we know we're inserting, keep animVal list in sync as necessary.

dom/svg/DOMSVGPathSegList.cpp

@@ -382,6 +382,15 @@ DOMSVGPathSegList::InsertItemBefore(DOMSVGPathSeg& aNewItem,
     aError.Throw(NS_ERROR_OUT_OF_MEMORY);
     return nullptr;
   }
+  if (AnimListMirrorsBaseList()) {
+    DOMSVGPathSegList *animVal =
+      GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+    if (!animVal->mItems.SetCapacity(
+          animVal->mItems.Length() + 1, fallible)) {
+      aError.Throw(NS_ERROR_OUT_OF_MEMORY);
+      return nullptr;
+    }
+  }
 
   AutoChangePathSegListNotifier notifier(this);
   // Now that we know we're inserting, keep animVal list in sync as necessary.

dom/svg/DOMSVGPointList.cpp

@@ -318,6 +318,15 @@ DOMSVGPointList::InsertItemBefore(nsISVGPoint& aNewItem, uint32_t aIndex,
     aError.Throw(NS_ERROR_OUT_OF_MEMORY);
     return nullptr;
   }
+  if (AnimListMirrorsBaseList()) {
+    DOMSVGPointList *animVal =
+      GetDOMWrapperIfExists(InternalAList().GetAnimValKey());
+    if (!animVal->mItems.SetCapacity(
+          animVal->mItems.Length() + 1, fallible)) {
+      aError.Throw(NS_ERROR_OUT_OF_MEMORY);
+      return nullptr;
+    }
+  }
 
   AutoChangePointListNotifier notifier(this);
   // Now that we know we're inserting, keep animVal list in sync as necessary.

dom/svg/DOMSVGTransformList.cpp

@@ -252,6 +252,13 @@ DOMSVGTransformList::InsertItemBefore(SVGTransform& newItem,
     error.Throw(NS_ERROR_OUT_OF_MEMORY);
     return nullptr;
   }
+  if (AnimListMirrorsBaseList()) {
+    if (!mAList->mAnimVal->mItems.SetCapacity(
+          mAList->mAnimVal->mItems.Length() + 1, fallible)) {
+      error.Throw(NS_ERROR_OUT_OF_MEMORY);
+      return nullptr;
+    }
+  }
 
   AutoChangeTransformListNotifier notifier(this);
   // Now that we know we're inserting, keep animVal list in sync as necessary.