[Theme] Allow NTP's background color changes. In this CL, NtpCustomizationConfigManager is able to notify its listeners if the user chooses a customized Chrome color, and the new color will be applied on NTP. We also save the color to the SharedPreference. Bug: 432527690 Change-Id: If301998ae57b0afa0ce1fe6b307e1e184ad92d91 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6856353 Commit-Queue: Xi Han <hanxi@chromium.org> Reviewed-by: Calder Kitagawa <ckitagawa@chromium.org> Cr-Commit-Position: refs/heads/main@{#1502821}
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