Bug 1636868 - Add RenderTextureHostWrapper for GPUVideoTextureHost r=jrmuizel

By using RenderTextureHostWrapper, we could reduce re-creation of RenderDXGITextureHostOGL and RenderDXGIYCbCrTextureHostOGL.

Differential Revision: https://phabricator.services.mozilla.com/D74838

gfx/layers/wr/AsyncImagePipelineManager.cpp

@@ -61,6 +61,18 @@ void AsyncImagePipelineManager::Destroy() {
   mDestroyed = true;
 }
 
+/* static */
+wr::ExternalImageId AsyncImagePipelineManager::GetNextExternalImageId() {
+  MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());
+  static uint64_t sResourceId = 0;
+
+  ++sResourceId;
+  // Upper 32bit(namespace) needs to be 0.
+  // Namespace other than 0 might be used by others.
+  MOZ_RELEASE_ASSERT(sResourceId != UINT32_MAX);
+  return wr::ToExternalImageId(sResourceId);
+}
+
 void AsyncImagePipelineManager::SetWillGenerateFrame() {
   MOZ_ASSERT(CompositorThreadHolder::IsInCompositorThread());