Announce color from Color Picker after initializing listeners

The color value is currently not being announced as part of the Color
Picker's initialization as it requires a color change in order for the
announcement to happen. Additionally, any color change that would happen
during initialization would not have any effect as the listener for
color change is added at the end of the process. This change ensures the
announcement of the color value happens by directly calling the AX
announcer after the event listeners of the Color Picker are initialized.

Change-Id: I4e9df5532f1d4bb1006f649b5221055ae239ac11
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4034966
Reviewed-by: Dan Clark <daniec@microsoft.com>
Commit-Queue: Luis Sanchez Padilla <lusanpad@microsoft.com>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1074243}