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: I46c2688fe9edf0444126895a0a3c404a9381ff72

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