This will cause the previous texture binding used by Skia to be
incorrectly unbound, such that should they need to re-used an existing
binding, we'll end up rendering blank instead.

Instead we should be using

    context->flushAndSubmit();
    context->resetContext(kAll_GrBackendState);

in `EmbedderExternalTextureGL::ResolveTexture` in order to notify Skia
that we've updated handles within the current binding and invalidate any
assumptions about previous modifications it has made to the context.

This reverts commit d6e59460.

Co-authored-by: Aaron Clarke <gaaclarke>

This reverts commit 8d73893b.

https://skia.googlesource.com/skia.git/+log/497bdf959908..975341304300

2021-03-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Chromium from e0abc3035c46 to 72a44ae7b7da (206 revisions)
2021-03-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll SwiftShader from d4550ab8d3f0 to fb53aa2bb7da (1 revision)
2021-03-29 skia-autoroll@skia-public.iam.gserviceaccount.com Roll Dawn from 125715248544 to b745df8537a0 (1 revision)
2021-03-28 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update SKP version

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC mtklein@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

https://dart.googlesource.com/sdk.git/+log/61d949d7ec1b..b2b8c997eefa

2021-03-28 dart-luci-ci-builder@dart-ci.iam.gserviceaccount.com Version 2.13.0-172.0.dev

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md