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This change:
1. Fills in content for the tutorial given in the OOBE.
2. Automatically opens the OOBE tutorial if ChromeVox is started from
the OOBE. Only do this if the
--enable-experimental-accessibility-chromevox-tutorial flag is enabled.
3. Adds a Panel method for creating the interactive tutorial. The logic
for this function existed prior to this change; we add this method for
better cleanliness and readability.

Bug: 1075752
Change-Id: I3aaefb2a934cde078747bfee105c1427af305400
AX-Relnotes: N/A
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330048
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796205}