Adds a LAST_NON_NULL window function to the trace processor. am: 7e47609cf2 am: 9c55fce8cc
Adds a LAST_NON_NULL window function to the trace processor. am: 7e47609cf2 am: 9c55fce8cc

Change-Id: I98dddd3f6632912b46bc595a2e2008cb00bac2af

google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto