When EGL_LOSE_CONTEXT_ON_RESET is set, ANGLE avoids to release D3D resources when ANGLE detects device reset. - https://searchfox.org/mozilla-central/rev/c79fc6e32a5b561205a71fcfef9112d34b4037ae/gfx/angle/checkout/src/libANGLE/Display.cpp#1011
Bug 1606046 Comment 1 Edit History
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When EGL_LOSE_CONTEXT_ON_RESET is set by CreateContextFlags::PREFER_ROBUSTNESS flag, ANGLE avoids to release D3D resources when ANGLE detects device reset. - https://searchfox.org/mozilla-central/rev/c79fc6e32a5b561205a71fcfef9112d34b4037ae/gfx/angle/checkout/src/libANGLE/Display.cpp#1011