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moment there is only total time and time to load all non-component extensions.
Time to load component extensions and time to notify all listeners is not
instrumented.

R=mek@chromium.org, mpearson@chromium.org
BUG=453073

Review URL: https://codereview.chromium.org/883023003

Cr-Commit-Position: refs/heads/master@{#313615}