[MD History] Add URL parameter for search.
This CL adds routing from the search term in the history toolbar to the
URL query. It also rewrites the old history page's #q=search queries into
?q=search to maintain compatibility.
BUG=
619799
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:closure_compilation;master.tryserver.chromium.linux:closure_compilation
Committed:
https://crrev.com/98fea99c967cbac5cd3959a3726d0a082c1acc93
Cr-Commit-Position: refs/heads/master@{#406515}