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This CL makes DCLayerTree to keep a Map for video processor which is
separated by SDR/HDR mode. The purpose is to prevent causing hardware
error when change VP from dealing HDR content to SDR content in some
Intel platform.

This CL also changes the place where setting colorspace of VP to
SwapChainPresenter::VideoProcessorBlt().

Bug: 1121061
Change-Id: I4a669750cb88d68d8655cb2d777c555b43ac3f5c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539559Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: Richard Li <richard.li@intel.com>
Cr-Commit-Position: refs/heads/master@{#832608}