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This removes the constraint for all bypassed RenderPasses to have
an opacity of 1 and src-over blending. As long as the inner content's
blend mode is a coefficient blend mode, we can reason about how it
would have combined with the implicit transparent black of the
RenderPass's initial clear color.

Bug: 1013735
Change-Id: I8d1849db254c4eff3f33b57f32204d6d439f0b83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1862662
Commit-Queue: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: weiliangc <weiliangc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712608}