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Using a dialog is a much cleaner solution because it handles all focus
trapping without attempting to capture TAB or require updating all
tabindex properties.

We removed the ability to swipe the drawer open in order to keep the
code simple.

BUG=633858
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2465433002
Cr-Commit-Position: refs/heads/master@{#438187}