Bug 1418877 - Fix key reuse check in AsyncImagePipelineManager::UpdateImageKeys() r=nical

gfx/layers/wr/AsyncImagePipelineManager.cpp

@@ -181,6 +181,7 @@ AsyncImagePipelineManager::UpdateImageKeys(wr::ResourceUpdateQueue& aResources,
   // If we already had a texture and the format hasn't changed, better to reuse the image keys
   // than create new ones.
   bool canUpdate = !!previousTexture
+                   && previousTexture->GetSize() == texture->GetSize()
                    && previousTexture->GetFormat() == texture->GetFormat()
                    && aPipeline->mKeys.Length() == numKeys;