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Previously, we made all cr-dialogs close on popstate. This is good,
except for navigable dialogs.

For navigable dialogs: It should open if the new route is the dialog's
route, and close otherwise. All the navigable dialogs already have code
that implements this behavior, but it conflicts with the popstate
event handler on cr-dialog.

This CL adds a parameter that disables this behavior for navigable
dialogs.

BUG=656918
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2445713004
Cr-Commit-Position: refs/heads/master@{#427249}