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Currently, we have three overlay formats: YUV, BGRA, RGB10A2. Previously,
we trace swap chain format with |is_yuv_swapchain_|, which can't provide
accurate information in current situation.

In this CL, we use a member variable |swap_chain_format_| to trace swap
chain format in use.

Bug: 1062184
Change-Id: I0d26564043f097afc0d1ef769c3854ee91a3462f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2336215
Commit-Queue: Richard Li <richard.li@intel.com>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796701}