Split events in WorkspaceDiff
Split events in WorkspaceDiff

The CL splits the events in WorkspaceDiff between WorkspaceDiff and
UISourceCodeDiff.

R=kprokopenko@google.com

Bug: 1228674
Change-Id: Ifec1282e899c241566d25817c82a900294bb84a8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3172831
Reviewed-by: Kateryna Prokopenko <04b7d4bdbd93555cee90f085bb91b72524d21fca@chromium.org>
Commit-Queue: Simon Zünd <38944668e9e2ca98ccd0275b53370f90fa55c113@chromium.org>

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