Split a MetricsLogStore object out of MetricsLogManager.
The MetricsLogStore handles all serialized logs, while MetricsLogManager
handles logs which are still being produced.
Creates a LogStore interface for MetricsLogStore and PersistedLogs to
implement. This will simplify creating a ReportingService that can be reused
by both UKM and UMA.
No functional changes intended.
BUG=693676
Review-Url: https://codereview.chromium.org/2689323010
Cr-Commit-Position: refs/heads/master@{#452356}
21 files changed
