58808 Introduce inherited navigator observer and refactor hero controller (cla: yes, f: cupertino, f: material design, framework, waiting for tree to go green)

58820 Timeline summary contains CPU, GPU and Memory usage (a: tests, cla: yes, framework, severe: performance, waiting for tree to go green)

58823 Add comments to flutter_driver for timeline class (a: tests, cla: yes, framework)

58829 Step 3 of 3: Remove opt-in for useMaterialBorderRadius on Dialogs (a: fidelity, a: quality, cla: yes, f: material design, framework, waiting for tree to go green)

58831 Step 3 of 3: Remove opt-in for debugCheckHasMaterialLocalizations assertion on TextField (a: internationalization, a: text input, cla: yes, f: material design, framework, waiting for tree to go green)