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course of a page load.

Two key values within Translate are the source language (language of the
web page) and the target language (the user's language). This new code
will track the source and target language over the course of a page load
and record the initial and final languages for every page load. We want
to record both the initial and final values, because the user can
manually change both the source and target language. In addition, this
new code will record the number of times the target language is changed.
We do not do the same for source language, because we expect the user to
change that much less frequently.

Full design doc: https://docs.google.com/document/d/1dyWh1Xw5VgUA00VA-5PTgKQ6ItziPBnSyeDR8saJ9vM/edit?usp=sharing

Bug: 111486
Change-Id: Ibb9fec8f2f831aaf7bea09a543167c0220d795ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543342Reviewed-by: Scott Little <sclittle@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Commit-Queue: Max Curran <curranmax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830668}