Allow SkGpuDevice::drawSprite to handle subset SkBitmaps
Allow SkGpuDevice::drawSprite to handle subset SkBitmaps

With the upcoming switch to SkSpecialImage in the blur image filter, it is possible for drawSprite calls to use an SkBitmap with an offset (e.g., a blur image filter with a cropRect and 0 blur radii). This simply updates the drawSprite code path to be origin aware.

This is calved off of: https://codereview.chromium.org/1785643003/ (Switch SkBlurImageFilter over to new onFilterImage interface)

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Review URL: https://codereview.chromium.org/1808743003

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