Only seen this on Windows so far, on both NVIDIA or AMD:

https://build.chromium.org/p/tryserver.chromium.angle/builders/win_angle_rel_ng/builds/6868
https://build.chromium.org/p/chromium.gpu.fyi/builders/Win7%20Release%20%28AMD%20R7%20240%29/builds/1462

Unsure exactly when this started. I think it's a V8 regression, from some info in the logs:

#
# Fatal error in ../../v8\src/heap/spaces-inl.h, line 372
# Debug check failed: top() >= top_on_previous_step_.
#
Backtrace:
	base::debug::StackTrace::StackTrace [0x66450EE7+55]
	base::debug::StackTrace::StackTrace [0x6644B68A+10]
	V8_Fatal [0x6702EC11+81]
	media::WebMediaCapabilitiesClientImpl::DecodingInfo [0x6702E5B6+1108]
	v8::internal::PagedSpace::AllocateRaw [0x65EFF8BB+43]
	v8::internal::Heap::AllocateRaw [0x65EFF7F9+505]
	v8::internal::Heap::AllocateFillerObject [0x65F2D910+32]
	v8::internal::Factory::NewFillerObject [0x65F045E2+34]
	v8::internal::Runtime::ThrowIteratorError [0x661006E9+969]
	v8::internal::Runtime_AllocateInTargetSpace [0x660FAD97+215]
Backtrace:
	(No symbol) [0x00000000]
	v8::base::OS::Abort [0x6702F0FD+13]
	v8::internal::PagedSpace::AllocateRaw [0x65EFF8BB+43]
	v8::internal::Heap::AllocateRaw [0x65EFF7F9+505]
	v8::internal::Heap::AllocateFillerObject [0x65F2D910+32]
	v8::internal::Factory::NewFillerObject [0x65F045E2+34]
	v8::internal::Runtime::ThrowIteratorError [0x661006E9+969]
	v8::internal::Runtime_AllocateInTargetSpace [0x660FAD97+215]
	(No symbol) [0x0C986C0A]
	(No symbol) [0x05EBE39E]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	(No symbol) [0x0C9F2FFB]
	v8::internal::StackGuard::InitThread [0x65EF8AB5+869]
	WTF::HashTableHelper<blink::Member<blink::XMLHttpRequest>,WTF::IdentityExtractor,WTF::HashTraits<blink::Member<blink::XMLHttpRequest> > >::IsEmptyOrDeletedBucket [0x680EEEFD+13]
Found crashpad_database_util

0033d00c 6702f0fd 0033d02c 6702e5b6 6876e1d4 0x0
	0033d02c 65eff8bb 6876e1d4 00000174 6876e244 chrome_child!v8::base::OS::Abort+0xd
	0033d050 65eff7f9 0033d07c 00000050 00000000 chrome_child!v8::internal::PagedSpace::AllocateRaw+0x2b
	0033d08c 65f2d910 0033d0bc 00000050 00000001 chrome_child!v8::internal::Heap::AllocateRaw+0x1f9
	0033d0ac 65f045e2 0033d0d4 00000050 01267700 chrome_child!v8::internal::Heap::AllocateFillerObject+0x20
	0033d0d8 661006e9 0033d118 00000050 01267700 chrome_child!v8::internal::Factory::NewFillerObject+0x22
	0033d108 660fad97 00000002 0033d158 01267700 chrome_child!v8::internal::Runtime::ThrowIteratorError+0x3c9
	0033d128 0c986c0a 00000002 0033d158 01267740 chrome_child!v8::internal::Runtime_AllocateInTargetSpace+0xd7
	0033d14c 05ebe39e 00000004 000000a0 3ac321b1 0xc986c0a
	0033d210 0c9f2ffb 3ac31cc5 3ac324f5 3ac324e9 0x5ebe39e
	0033d29c 0c9f2ffb 00000000 0000000c 3ac2f28d 0xc9f2ffb
	0033d364 0c9f2ffb 00000002 0000000c 3ac2f28d 0xc9f2ffb
	0033d3b4 0c9f2ffb 00000000 00000002 00000000 0xc9f2ffb
	0033d408 0c9f2ffb 00000002 00000000 00002806 0xc9f2ffb
	0033d454 0c9f2ffb 00000000 00002806 0000000c 0xc9f2ffb
	0033d4c4 0c9f2ffb 3ac2ea25 3ac2e9c9 3ac2e1e1 0xc9f2ffb
	0033d52c 0c9f2ffb 3ecacf79 27da34e1 04804185 0xc9f2ffb
	0033d640 65ef8ab5 04804185 3ecac7a5 1a4e81e1 0xc9f2ffb
	0033d694 680eeefd 2f6e4f08 0033d798 0033d76c chrome_child!v8::internal::StackGuard::InitThread+0x365
	00000000 00000000 00000000 00000000 00000000 chrome_child!WTF::HashTableHelper<WTF::KeyValuePair<blink::Member<blink::CSSPendingSubstitutionValue const >,blink::Member<blink::HeapHashMap<enum blink::CSSPropertyID,blink::Member<blink::CSSValue const >,WTF::IntHash<unsigned int>,WTF::HashTraits<enum blink::CSSPropertyID>,WTF::HashTraits<blink::Member<blink::CSSValue const > > > > >,WTF::KeyValuePairKeyExtractor,WTF::HashTraits<blink::Member<blink::CSSPendingSubstitutionValue const > > >::IsEmptyOrDeletedBucket+0xd

CC'ing some folks who might be able to route this to the right people.