docs - Add analytics to docs.
docs - Add analytics to docs.

Bug: skia:
Change-Id: Ief217b73c78bb907e8e57b82579c0441d7783862
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/197709
Reviewed-by: Herb Derby <9e12a3d2bbf73546e47cc9958f6ba8f3215b7eaf@google.com>
Reviewed-by: Heather Miller <2e22000c5d22374561fe5fba576a31095b72dc2e@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot