Adds a LAST_NON_NULL window function to the trace processor. am: 7e47609cf2 am: 9c55fce8cc am: 0ae51e0c26 am: 870ef372a3 am: 6cfcacc122
Adds a LAST_NON_NULL window function to the trace processor. am: 7e47609cf2 am: 9c55fce8cc am: 0ae51e0c26 am: 870ef372a3 am: 6cfcacc122

Change-Id: Ib5ee39a28a32542eac614c6b0da3c380472fea84

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