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Currently we are only reporting metrics when force installed extensions
either fail installation or ExtensionRegistry's OnExtensionLoaded (...)
event is received.
This CL reports the time elapsed for enterprise policy forced
extensions to become ready for use by reporting statistics when force
installed extensions either fail installation or ExtensionRegistry's
OnExtensionReady(...) event is received.
These statistics are being collected as part of the effort to improve
force installed extensions reliability.

Following histogram is added:
Extensions.ForceInstalledReadyTime

Bug: 1131418
Change-Id: Ief524819deb8cca81231765439700c265d9e7b96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424286Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Swapnil Gupta <swapnilgupta@google.com>
Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Commit-Queue: Saurabh Nijhara <snijhara@google.com>
Cr-Commit-Position: refs/heads/master@{#811223}