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Update code to better match the latest Screen Enumeration proposal:
https://github.com/spark008/screen-enumeration/blob/master/EXPLAINER.md

Use the existing Display mojo struct, instead of a new parallel struct.
Add [RuntimeEnabled=ScreenEnumeration] Screen attributes, instead of a new parallel object.
Rename requestDisplays to getScreens. Update test expectations.

Test with chrome://flags#enable-experimental-web-platform-features or --enable-blink-features=ScreenEnumeration

Bug: 994889
Test: Automated; getScreens() works with flag enabled.
Change-Id: I54f1594c5b6f1ad2a6532f3ee5f8a0184408c7b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842339
Commit-Queue: Michael Wasserman <msw@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Staphany Park <staphany@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712839}