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This creates an EG2 test suite for Translate for the new Messages UI.
Many tests are either direct copies or similar to those found in
TranslateTestCase. Some of them were also not moved over, because they
do not apply to the new Messages design.

Bug: 1014959
Change-Id: I3e8c5865686f23f500a31902dbfd60fe225bda6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2027127
Commit-Queue: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737531}