When I revert Bug 1526213, the problem seemed to be disappeared. "doc.build_frame()" seemed to work as throttling webgl task. Since Bug 1526213 fix, we could skip doc.build_frame() during canvas empty transaction.
Bug 1531294 Comment 22 Edit History
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When I revert Bug 1526213, the problem seemed to be disappeared. "doc.build_frame()" seemed to work as throttling webgl task. Since Bug 1526213 fix, we could skip doc.build_frame() during canvas empty transaction. It caused to webgl task more rapid and d3d11 api stalled by too many gpu tasks.