Bug 1393031 - Make ResourceUpdateQueue move-only. r=sotaro

gfx/webrender_bindings/WebRenderAPI.cpp

@@ -435,9 +435,25 @@ ResourceUpdateQueue::ResourceUpdateQueue()
   mUpdates = wr_resource_updates_new();
 }
 
+ResourceUpdateQueue::ResourceUpdateQueue(ResourceUpdateQueue&& aFrom)
+{
+  mUpdates = aFrom.mUpdates;
+  aFrom.mUpdates = nullptr;
+}
+
+ResourceUpdateQueue&
+ResourceUpdateQueue::operator=(ResourceUpdateQueue&& aFrom)
+{
+  mUpdates = aFrom.mUpdates;
+  aFrom.mUpdates = nullptr;
+  return *this;
+}
+
 ResourceUpdateQueue::~ResourceUpdateQueue()
 {
-  wr_resource_updates_delete(mUpdates);
+  if (mUpdates) {
+    wr_resource_updates_delete(mUpdates);
+  }
 }
 
 void

gfx/webrender_bindings/WebRenderAPI.h

@@ -53,8 +53,13 @@ struct Line {
 class ResourceUpdateQueue {
 public:
   ResourceUpdateQueue();
-
   ~ResourceUpdateQueue();
+  ResourceUpdateQueue(ResourceUpdateQueue&&);
+  ResourceUpdateQueue(ResourceUpdateQueue&) = delete;
+  ResourceUpdateQueue(const ResourceUpdateQueue&) = delete;
+  ResourceUpdateQueue& operator=(ResourceUpdateQueue&&);
+  ResourceUpdateQueue& operator=(ResourceUpdateQueue&) = delete;
+  ResourceUpdateQueue& operator=(const ResourceUpdateQueue&) = delete;
 
   void AddImage(wr::ImageKey aKey,
                 const ImageDescriptor& aDescriptor,