ui: Clear traceProtoWriter between ADB recording sessions. am: 33265b79e5
ui: Clear traceProtoWriter between ADB recording sessions. am: 33265b79e5

Original change: https://android-review.googlesource.com/c/platform/external/perfetto/+/1371936

Change-Id: I532a47628d136134dc594018400774ce635a4391

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