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We need to pass HDRMetadata to SwapChainPresenter which needs proper
metadata to set video processor. Moving media::HDRMetadata to ui/gl/ is
a prepared work for that.
This CL also move media::DisplayHelper to ui/gl/. Since it only provide
functions related with HDRMetadata, this CL renames it to
HDRMetadataHelper.

Bug: 1122910
Change-Id: I0670c210cd0c194bf0ec1872cb5442d1f6a9b324
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387620
Commit-Queue: Richard Li <richard.li@intel.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804522}