Add GL_PROGRAM_COMPLETION_QUERY_CHROMIUM

This makes the query of GL_COMPLETION_STATUS_KHR to programs much
cheaper by minimizing the round-trip to the GPU thread.

Bug: 881152, 957001
Change-Id: Iadfa798af29225e752c710ca5c25f50b3dd3101a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1586630
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657568}
bool WebGLRenderingContextBase::ExtensionSupportedAndAllowed(
    const ExtensionTracker* tracker) {
  if (tracker->Draft() &&
      !RuntimeEnabledFeatures::WebGLDraftExtensionsEnabled())
    return false;
  if (!tracker->Supported(this))
    return false;
  if (disabled_extensions_.Contains(String(tracker->ExtensionName())))
    return false;
  return true;
}

bool WebGLRenderingContextBase::ExtensionSupportedAndAllowed(
    const ExtensionTracker* tracker) {
  if (tracker->Draft() &&
      !RuntimeEnabledFeatures::WebGLDraftExtensionsEnabled())
    return false;
  if (!tracker->Supported(this))
    return false;
  if (disabled_extensions_.Contains(String(tracker->ExtensionName())))
    return false;
  return true;
}
