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This CL adds a switch enum to chrome://flags to change the icon
displayed by the search button in the bottom toolbar.

Bug: 866013
Change-Id: I1892cb02f42bc6d1324e276b9022663e48b45b3b
Reviewed-on: https://chromium-review.googlesource.com/c/1297972
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602361}