Since themes are designed with the custom frame in mind, we need to offset the background when the custom frame is off.
Since themes are designed with the custom frame in mind, we need to offset
the background when the custom frame is off.

This is needed after http://codereview.chromium.org/193030 was checked in (which fixed a related bug on Windows).

We don't translate the x values because the tab renderer code
already takes the x offset into consideration.

TEST=Install the Color Chips theme from the theme gallery.  The vertical white lines should line up on the inactive tabs.

Review URL: http://codereview.chromium.org/194080


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@25988 0039d316-1c4b-4281-b951-d872f2087c98

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