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There are scenarios where we fail to bootstrap the source id from Java.
This also means that we fail to setup the page for metrics reporting.
If the page is not set up, calls to RecordEventMetrics will crash.
Until we understand why the bootstrapping can fail and fix that, this
CL will cause us to drop events without a valid source id so that we
don't crash.

Bug: 832712
Change-Id: I4a01c8cf7a9eaae645960dc17dada8a4b5cdd3fa
Reviewed-on: https://chromium-review.googlesource.com/1033959
Commit-Queue: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Donn Denman <donnd@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554767}