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This adds the concept of "hostPackage" vs "package", which for webview
will contain different values.

TBR=agrieve  # trivial rename in devtools_http_handler.cc
Bug: 620323

Change-Id: I4a3c3376d3793eb3ddb90afe3359e320d6255edc
Reviewed-on: https://chromium-review.googlesource.com/939715
Commit-Queue: agrieve <agrieve@chromium.org>
Reviewed-by: Maria Khomenko <mariakhomenko@chromium.org>
Reviewed-by: Tobias Sargeant <tobiasjs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541114}