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This CL computes the mixed content status (blockable, optionally
blockable, or not mixed) of resource requests before they are sent to
DevTools via the InspectorResourceAgent. The ResourceRequests's mixed
content status gets sent to DevTools as part of the Request parameter to
the requestWillBeSent event. The mixed content status will be used to
display mixed resources in the Security panel.

BUG=518065

Review URL: https://codereview.chromium.org/1299493003

git-svn-id: svn://svn.chromium.org/blink/trunk@200936 bbb929c8-8fbe-4397-9dbb-9b2b20218538