Parametrize TimelinePresentationModel with coalescable record types

This CL removes dependency on WebInspector.TimelineModel.RecordType as underlying implementation may use tracing events in which case coalescable types should be from  WebInspector.TracingTimelineModel.

BUG=361045

Review URL: https://codereview.chromium.org/336373002

git-svn-id: svn://svn.chromium.org/blink/trunk@176306 bbb929c8-8fbe-4397-9dbb-9b2b20218538