Ensure fuzzer can pass checks on debug builds.

Small bug fixes: browser UI CompositorFrame now has a valid frame_token,
and validation logic for the fuzzed CompositorFrame ensures that the
RenderPass output_rect contains the damage_rect, and that the DrawQuad's
rect contains its visible_rect.

R=kylechar@chromium.org

Bug: 934656
Change-Id: If90756a4a608407952fde27e308db1d90a14f1fb
Reviewed-on: https://chromium-review.googlesource.com/c/1489632
Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Céline O'Neil <celineo@google.com>
Cr-Commit-Position: refs/heads/master@{#635686}
2 files changed