55699 [flutter_tools] allow pulling performance data from assemble (cla: yes, tool)

55701 [flutter_tools] surface missing assets originating package (cla: yes, tool, waiting for tree to go green)

55704 [flutter_tools] ensure etag headers are ascii (cla: yes, tool)

55715 [flutter_tools] add –dart-define option for fuchsia build (cla: yes, tool, waiting for tree to go green)

55759 [flutter_tools] catch ProcessException and throw ToolExit during upgrade (cla: yes, tool, waiting for tree to go green)

55762 Print stdout and stderr when the ssh command failed (cla: yes, tool, waiting for tree to go green)

55772 Revert “[flutter_tools] migrate FlutterView to new vm_service” (cla: yes, tool)