Add mixed content and secure URL info to SecurityStyleExplanations

content::SecurityStyleExplanations is used to convey an explanation for
the lock icon (calculated by //chrome) to the DevTools security panel
(whose protocol handler is in //content).

To be able to more flexibly explain mixed content in the security panel,
this CL gives the security panel more structured information than the
opaque human-readable mixed content string that it was previously
getting. Namely, this CL gives devtools information about whether mixed
content was displayed/run on the page (so that the security panel can
display a link to the Network panel to show mixed resources), and what
security style //chrome uses to represent displaying/running insecure
content (so that the security panel can display the appropriate icon
next to a list of mixed resources).

This CL also adds a |scheme_is_cryptographic| boolean field to the information
that the security panel gets. This is to allow devtools to unambiguously
distinguish HTTP page loads from HTTPS, now that
SECURITY_STYLE_UNAUTHENTICATED is no longer reserved for HTTP only (see
https://crbug.com/513863).

The corresponding Blink changes (must land first) are in crrev.com/1275723005

BUG=518065,517186

Review URL: https://codereview.chromium.org/1275793004

Cr-Commit-Position: refs/heads/master@{#343411}

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