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Previously, the caption button container would always paint in active or
inactive frame colors as appropriate. However, for themes with a
different frame/caption and tab background color, in normal tabbed
browser mode, this would result in the buttons painting against the
wrong background color.

Now whether or not the container paints its background can be controlled
by external code.

Bug: 1099195
Change-Id: I6c46de4f9eb423a0aecb9ccee03231ca42dfb462
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2284447Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786044}