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This CL adds a jni method to let QualityEnforcer notify native and send
a console message for violations.
We will move to use devtools issue tab instead in the near future.
(TODO in quality_enforcer.cc)

The warning together with the toast warning are behind a flag
TRUSTED_WEB_ACTIVITY_QUALITY_ENFORCEMENT_WARNING, just in case we need
to disabled them for any reason.
The flag is *Enabled* for now since we have all approval on launch bug:
crbug/1127892

To have a valid tab and WebContent to send the message to, moves the
check of digital asset link violation to onDidFinishNavigation from
onFinishNativeInitialization.

This also moves the ViolationType enum to c++ part to be able to share
between c++ and java.

Bug: 1147479
Change-Id: If0f80fee412ea522a7202226a72b169092525cef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2530800
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826701}