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HAR files can now be exported and imported from the network panel. This
can be done by dragging a HAR file and dropping it in the Network Log
View.

R=caseq
TBR=dgozman
BUG=374557

Change-Id: Ibb451fc0a2a4d34739e596c320e99fb8866c6cac
Reviewed-on: https://chromium-review.googlesource.com/557995
Commit-Queue: Blaise Bruer <allada@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487419}