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This CL takes a prepapatory step to WebLayer sharing Chrome's
ExternalNavigationHandler for launching external intents by creating
and populating the ExternalNavigationParams struct that gets passed
to the former class. I adapted the building of ExternalNavigationParams
in //chrome's
InterceptNavigationDelegateImpl.java:buildExternalNavigationParams() to
//weblayer, leaving notes in the code where we might need to refine
the calculation of some arguments over time.

This CL also changes //weblayer's ExternalNavigationHandler to take in
the params just so that the constructed object is used. There is no
behavioral change.

Bug: 1031465
Change-Id: If7135fcbfc9d369f2683208fde12725925156736
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2100974Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Commit-Queue: Colin Blundell <blundell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751051}