[Dolphin] Add Hour Bin predictor to Dolphin

This CL add hour bin predictor to Dolphin. The logic in this CL is
similar to the logic of hour bin predictor in Roselle.

Bug: 921444
Change-Id: Idb4c3f1f4905c9cdfa91d5b810149c36c0675418
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1594381
Commit-Queue: Thanh Nguyen <thanhdng@chromium.org>
Reviewed-by: Charles . <charleszhao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#662079}
7 files changed