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This CL adds a component, namely JourneyInfoFetcher, to talk with the
Memex endpoint server. The JourneyInfoFetcher makes a request
to the server and gets a SwitcherJourney response in json format.
Then JourneyInfoFetcher parses the response accordingly
to create a list of pageloads for the given callback.

Bug: 853290
Change-Id: If31982dac57fbb795f72c09cc8914cfaa6b49bdb
Reviewed-on: https://chromium-review.googlesource.com/c/1155719
Commit-Queue: Mei Liang <meiliang@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Nick Harper <nharper@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608319}