Batch all circular rrects together

When possible, this change will place all circular rrect
types in the same batch. If the batch is all fills, we
use the fill shader, otherwise we use the stroke shader.

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2283973002

Review-Url: https://codereview.chromium.org/2283973002
1 file changed