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Previously PaintChunk::hit_test_data was updated only in
HitTestData::RecordHitTestRect(), so when we copied cached subsequence,
the PaintChunks didn't have hit_test_data.

Now add HitTestDisplayItem to store the hit test data in display items,
and update PaintChunk::hit_test_data in PaintArtifact constructor.

Change-Id: I8a96823f15c0107fc21e5b388763ebfc3925eef0
Reviewed-on: https://chromium-review.googlesource.com/c/1325570
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606921}