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Add a comon method to our testing class that can be used in EG1 and EG2.

|EarlGrey| has 2 methods to check for the device keyboard, once for
each version. And this check is common in the EG2 migration.

Adding it to the base test class instead of to |EarlGrey| to avoid
creating a 3rd method signature for it. Once EG1 support is removed a
simple search and replace can be used to clean this.

Bug: 1016368
Change-Id: I0922dcbcff4cc349a429e734aa9586d0751a3034
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873757
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708931}