GitLab

This CL adds :
1 - Summary card IPH, that is shown after all other tutorial IPHs have
been tapped by the user. Summary card is treated as a synthetic tutorial
available only on NTP. It isn't addded to the actual list of tutorials
which shows up elsewhere, e.g. tutorial list page. Tapping on summary
card opens up the tutorial list page.
2 - Added remaining IPHs : chrome intro IPH, voice search IPH and their
corresponding tutorials/proto at the backend.
3 - Renamed IPH features to be NTP specific since we will have the same
tutorial shown on other surfaces as well. The click/dismiss events
are kept generic so that they can be shared across NTP and non-NTP IPHs.

Bug: 1117186, 1130255
Change-Id: I101b3a69cfa41bfcdbc45264c9f800fa3a0d2f26
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438778
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815224}