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Many force installed extensions fail to install inside
SandboxedUnpacker with error UNPACKER_CLIENT_FAILED error. We
report a string that gives details about this error. We want to report
this error detail through event based reporting. This CL is a pre
work that reports detailed error to InstallStageTracker.

Bug: b/173099675
Change-Id: I541ed65b209073bb9434db75567e94e955b4c64c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532082Reviewed-by: Oleg Davydov <burunduk@chromium.org>
Reviewed-by: Saurabh Nijhara <snijhara@google.com>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Swapnil Gupta <swapnilgupta@google.com>
Cr-Commit-Position: refs/heads/master@{#830559}