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This change enables the native AutocompleteMatch object to create and
retain a copy of its corresponding java counterpart.

The change essentially shifts code around, moving logic away from
AutocompleteController into AutocompleteMatch (both Java and Native).

The change optimizes slightly creation of the Java counterparts by
retaining an object if it's already created. This comes in handy for
every match that is backfilled on every keystroke (about 3 times every
time we call AutocompleteController::Start() to get new matches).

Java AutocompleteMatch objects are lazily constructed to reduce
penalty when native objects end up thrown away -- see:
* AutcompleteController#classify(),
* AutocompleteController#qualifyPartialUrlQuery()

Bug: 1138587
Change-Id: I8c5437cfb0203d5c7f5e1d79747eee3f15b7b0b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538499
Commit-Queue: Tomasz Wiszkowski <ender@google.com>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Reviewed-by: Tommy Li <tommycli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828488}