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This CL adds a histogram to track which of three possible interactions were used to change the current page in the tab grid.

Bug: 879487
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I35d6cb289b4c9fb8418e8d40f356bf914ae5d302
Reviewed-on: https://chromium-review.googlesource.com/1193948
Commit-Queue: Mark Cogan <marq@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587974}