re-apply r34183
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linux: theme scrollbars from GTK theme
Pick the color of the slider's thumbpart and rail from the GTK theme.
We cannot match the exact visual appearance of the GTK theme, as
rendering engines can make arbitrary changes to the actual visual
appearance. But by sampling a representative set of pixels, we ensure
that we will at least match the general color scheme.
BUG=10949
patch by <markus [at] chromium>
original review: http://codereview.chromium.org/400027/show
Review URL: http://codereview.chromium.org/479006
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@34285 0039d316-1c4b-4281-b951-d872f2087c98
24 files changed
