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Flagged selection, text search bug fix, new rebaseline.

This CL implements flag feature from results.html.

I've used this feature to rework "Rebaseline" feature. Now it is just
another format.

Also, fixed a bug where hitting enter in text search would display 
results twice.

With this, I think we've reached feature parity with results.html. Once
it is in, I'll make another pitch to replace results.html with 
test-expectations.

Bug: 726520
Change-Id: I811fead7940c7c1e44326ea03c3394ccf06a44bc
Reviewed-on: https://chromium-review.googlesource.com/720172
Commit-Queue: Aleks Totic <atotic@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#509703}