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Previously, failing to invoke an external protocol handler ('foo://bar')
would fail silently if the protocol was not registered or if the user
gesture requirement was not met. This limitation made it difficult for
web developers to troubleshoot such situations. This CL emits errors to
the Developer Tools console when the protocol handler is not registered,
is forbidden, or is temporarily blocked pending a user-gesture.
Similarly, if an external handler is launched, an informational log
entry is added.

Bug: 1096610
Change-Id: Ie562d0c030f138f7e5ac0a09576ba73a79de3971
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252848Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Commit-Queue: Eric Lawrence [MSFT] <ericlaw@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#782007}