Fix the activity name in the Gallery back button memory metric (#7527)
Fix the activity name in the Gallery back button memory metric (#7527)


cbracken/flutter,flutter/flutter,flutter/flutter,flutter/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,tvolkert/flutter,flutter/flutter,tvolkert/flutter,turnidge/flutter,cbracken/flutter,tvolkert/flutter,cbracken/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,tvolkert/flutter,cbracken/flutter,cbracken/flutter,Hixie/flutter,turnidge/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,cbracken/flutter,Hixie/flutter,Hixie/flutter,flutter/flutter,tvolkert/flutter,Hixie/flutter,tvolkert/flutter,tvolkert/flutter,flutter/flutter,turnidge/flutter,flutter/flutter,turnidge/flutter,Hixie/flutter,cbracken/flutter,turnidge/flutter,cbracken/flutter,flutter/flutter