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This change renames OnDomStorageAccess to OnStorageAccess from
MetricsWebContentObserver->PageLoadMetricsObserver. It adds a new
parameter access_type denoting what storage medium is being accessed.

This change is a precursor change to new metrics measuring third party
storage usage. OnStorageAccess is currently used for LocalStorage and
SessionStorage but will be expanded to cover other types of storage
in future changes.

BUG=1059915

Change-Id: I8fe5e6ed8d934723b1d31b6459bd77c4b8baf700
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094213Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: John Delaney <johnidel@chromium.org>
Reviewed-by: Yao Xiao <yaoxia@chromium.org>
Commit-Queue: Justin Miron <justinmiron@google.com>
Cr-Commit-Position: refs/heads/master@{#749681}