DevTools: Make copy color in color picker screen-reader accessible
DevTools: Make copy color in color picker screen-reader accessible

This change was reviewed earlier here https://chromium-review.googlesource.com/c/chromium/src/+/1686452 was broken down as below
1. Make copy color in color picker keyboard accessible https://chromium-review.googlesource.com/c/chromium/src/+/1817416
2. Make copy color in color picker screen-reader accessible https://chromium-review.googlesource.com/c/chromium/src/+/1818297

Gif showing UI with this change split from original change https://imgur.com/faSS7PO

Bug: 963183
Change-Id: If06b18bb640c8171343d60a743a65d062895cdde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1818297
Commit-Queue: Chandani Shrestha <52538cdd559ab5325fe6b80437501fc583a9e806@microsoft.com>
Reviewed-by: Yang Guo <1cf0af8245a3a17a632a2c73531392b0f9761c76@chromium.org>
Reviewed-by: John Emau <c153e6e600be23fb28cec0b08551440e4bf7575d@microsoft.com>
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#703879}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 81257f8c54c370237d1f7ab3fd68f32c3623b98d

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