Fixes bug in RootViewGtk where we we might not paint correctly if SchedulePaint is invoked consecutively with different regions. Windows has similar code.
Fixes bug in RootViewGtk where we we might not paint correctly if
SchedulePaint is invoked consecutively with different regions. Windows
has similar code.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/147170

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@19338 0039d316-1c4b-4281-b951-d872f2087c98

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