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Add a new ShelfItemType for TYPE_LACROS_BROWSER, following the pattern
of TYPE_BROWSER_SHORTCUT. Wire it to its own ShelfItemDelegate in
//chrome/browser/ui/ash. For now, the icon does nothing when clicked.
We need to wire it to upstart to actually start the browser.

Bug: 1072472
Test: manually deploy to device, two browser icons appear

Change-Id: I12578745f627df4452fcd99fe41716eedfb834d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2155991
Commit-Queue: James Cook <jamescook@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762044}