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This version of the Timeline allows the developer to see a logical view over the operations involved in each frame. Events are grouped by frame and shifted accordingly to avoid to have overlapped frame. See runtime/observatory/web/timeline.js for the undestrand the steps involded in the process. Change-Id: I3980a3278a32fe69ed70db07cfa7189dc0c9a643 Reviewed-on: https://dart-review.googlesource.com/5603 Commit-Queue: Carlo Bernaschina <cbernaschina@google.com> Reviewed-by: Todd Turnidge <turnidge@google.com>