[PDF] Add debug assert to detect failure of GDI cache hack.
[PDF] Add debug assert to detect failure of GDI cache hack.

If we start hitting this check, then it's likely that something has regressed in WebKit.

Original CL from arthurhsu@chromium.org: http://codereview.appspot.com/5322063/

Review URL: http://codereview.appspot.com/5320062

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@2581 2bbb7eff-a529-9590-31e7-b0007b416f81

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