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With the profile picker experiment, the user might get a color theme
even if they never interacted with the color picker.

This CL adds a new "ChromeColors.ColorApplied" histogram that shows
how often users interact with the color picker.

Bug: 1063856
Change-Id: I2973199fddf57bedf283bb70f69597ea836d24b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2593126Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Monica Basta <msalama@chromium.org>
Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Jan Krcal <jkrcal@chromium.org>
Commit-Queue: Alex Ilin <alexilin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840098}