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browser_command_controller_interactive_browsertest refactor prep

This CL sets up a subsequent CL which refactors a shared chunk of code
out of the browsertest file.

These files are being checked in as-is (i.e. trigger a number of
formatting warnings) however they aren't included in any build files
so they shouldn't cause any build issues and will be fixed in the
follow-up CL.

TBR=sky@chromium.org

Change-Id: I428463c0a6c9e942899a44c76bebb2e0e0b34856
Reviewed-on: https://chromium-review.googlesource.com/1071070Reviewed-by: Joe Downing <joedow@chromium.org>
Commit-Queue: Joe Downing <joedow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561388}