Flickering happened when SharedSurface_ANGLEShareHandle is destroyed before RenderDXGITextureHostOGL::EnsureLockable() is called on Render thread. RenderDXGITextureHostOGL failed at device->OpenSharedResource() . In this case, SharedSurface_ANGLEShareHandle failed to render. Then black was rendered.
If TextureClient::CancelWaitForNotifyNotUsed() is not called, the refcount is kept until the host side ends its usage. The refcount is removed by CompositorBridgeChild::NotifyNotUsed().
Depends on D33265
Differential Revision: https://phabricator.services.mozilla.com/D33143
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extra : moz-landing-system : lando
e9e8848ea1