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This CL fixes an issue where combobox dropdowns would render in the wrong
place for tabs that were created in the background. This was happening
because the native view and clipping windows weren't being added in the
right order, causing the incorrect screen space coordinates to get
passed around.

BUG=394715

Review URL: https://codereview.chromium.org/399343003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284913 0039d316-1c4b-4281-b951-d872f2087c98