In gm, install drawFilter for pipe and tiledPipe.
In gm, install drawFilter for pipe and tiledPipe.

Fixes bugs in drawing un-antialiased text in gm.

Review URL: https://codereview.chromium.org/12812016

git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@8173 2bbb7eff-a529-9590-31e7-b0007b416f81

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