bug 1188415 - add document tree consistancy checks to more message handlers r=davidb

accessible/ipc/DocAccessibleParent.cpp

@@ -19,6 +19,8 @@ DocAccessibleParent::RecvShowEvent(const ShowEventData& aData)
   if (mShutdown)
     return true;
 
+  CheckDocTree();
+
   if (aData.NewTree().IsEmpty()) {
     NS_ERROR("no children being added");
     return false;
@@ -48,6 +50,8 @@ DocAccessibleParent::RecvShowEvent(const ShowEventData& aData)
   }
 #endif
 
+  CheckDocTree();
+
   return true;
 }
 
@@ -118,6 +122,8 @@ DocAccessibleParent::RecvHideEvent(const uint64_t& aRootID)
   parent->RemoveChild(root);
   root->Shutdown();
 
+  CheckDocTree();
+
   return true;
 }
 
@@ -190,9 +196,12 @@ DocAccessibleParent::RecvBindChildDoc(PDocAccessibleParent* aChildDoc, const uin
   if (!aID)
     return false;
 
+  CheckDocTree();
+
   auto childDoc = static_cast<DocAccessibleParent*>(aChildDoc);
   bool result = AddChildDoc(childDoc, aID, false);
   MOZ_ASSERT(result);
+  CheckDocTree();
   return result;
 }