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This CL adds support to js2gtest for Mojo Lite WebUI Browser
Tests. This involves adding an extra mojo_lite_webui test type, and
adding the lite bindings to the page when a test is run.

Bug: 849993
Change-Id: Idadb098fb4c4a67535f59c80c8b4781a635da59b
Reviewed-on: https://chromium-review.googlesource.com/c/1309556Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: calamity <calamity@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606304}