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This CL adds support for text and background opacity on Win10 by
computing the color string with an alpha value corresponding to the
user's choice in Settings.
In addition, it also adds support for window color (with opacity) now
that CaptionStyle also contains a string for window_color.

With this change, all caption styling properties that show up in Win10
Settings are now supported in Chromium on Win10. New Properties added:
1. Caption Text Opacity
2. Background Opacity
3. Window Color
4. Window Opacity

Bug: 1001736
Change-Id: I3e80f88219faa7407bbd015074c486bc4d680e5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1794002
Commit-Queue: Rahul Singh <rahsin@microsoft.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695853}