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Change the FIDL interface QueryableData::GetAllEntries() to GetChangedEntries(),
which is identical to the current implementation on the first
invocation but on, but for subsequent invocations it uses hanging
callbacks to send incremental changes to the client.

The change is necessary for allowing QueryableData values to change at
page runtime.

Implementation of support for incremental change events are reserved for
a followup CL.


Bug: 929291
Change-Id: I7af7e77130eff55699a90fd5aff0a581bf3e3dd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1500021
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637909}