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[Bisected] WebGL2 failures with Intel Iris driver

There are several failures caught in recent WebGL 2.0 conformance test with Iris driver. They were tested on Coffee Lake (Intel UHD Graphics 630), Ubuntu 19.10 and latest master Mesa (commit: 290b827c1cfe0e99558cf1351bbb8ad2ea678bc0). Steps to repro:

  1. Download nightly Chromium from https://download-chromium.appspot.com/. We couldn't repro this issue with official channel of Chrome (including Dev/Beta/Stable) yet, and I don't know the exact reason. But a big diff is nightly build already switched to use ANGLE while the official build doesn't use ANGLE by default.
  2. Visit Khronos WebGL 2.0 website: https://www.khronos.org/registry/webgl/sdk/tests/webgl-conformance-tests.html?version=2.0.1.
  3. Run one of below cases: conformance/rendering/out-of-bounds-array-buffers.html (flaky) conformance2/rendering/element-index-uint.html (flaky) conformance2/rendering/out-of-bounds-index-buffers-after-copying.html (flaky) conformance2/rendering/blitframebuffer-filter-outofbounds.html (always failed)

flaky means we need to run the case more than once before hitting a failure. However, for these flaky cases, it's still easy to repro within 10 runs.

  1. You may see some failures now while these cases all passed on i965 driver steadily.
Edited by Paul Che
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