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(1) Add HourAppLaunchPredictor with unit test.

(2) Add SerializationTesterAppLaunchPredictor for testing
    AppSearchResultRanker materialization logic.

(3) Extend AppLaunchPredictor interface to support more functions.

Bug: 871674
Change-Id: I38bbc0b7efd1ed3576c4c3d170c553ec80dcec93
Reviewed-on: https://chromium-review.googlesource.com/1189506
Commit-Queue: Charles . <charleszhao@chromium.org>
Reviewed-by: Jia Meng <jiameng@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590133}