Don't use SkRect::MakeLargest() for clip bounds in image filter tests.
Don't use SkRect::MakeLargest() for clip bounds in image filter tests.

Much of the Skia code dealing with clip bounds does not handle
overflow, so if we start doing any math on these rects, the code will
break. Use explicit reasonable values instead.

BUG=skia:

Review URL: https://codereview.chromium.org/1479563002

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