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Added tests for content indexing

This Cl adds tests for content indexing
1 - Adds basic tests for switching chips and tabs
2 - Adds basic tests for content indexed groups and non-group items

Bug: 1052193
Change-Id: I892896d72b0c1e09c0f1a363f3f5a1ae08e0acd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056105Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742924}