Fix a perf regression introduced by r7594:  when computing a texture cache key, use the resolved (Top or Bottom) surface origin, never Default, otherwise we never get a cache hit.

Covered by polygon, path benches.  See also:  https://code.google.com/p/chromium/issues/detail?id=174749.

Review URL: https://codereview.appspot.com/7299059

git-svn-id: http://skia.googlecode.com/svn/trunk@7635 2bbb7eff-a529-9590-31e7-b0007b416f81
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