81250 Improve performance of debugCheckHasDirectionality (framework, f: material design, cla: yes, waiting for tree to go green)

81282 Expose the alignment property for DropdownButton and item (framework, f: material design, cla: yes, waiting for tree to go green)

81295 Override MediaQuery for WidgetsApp (severe: new feature, framework, f: material design, cla: yes, a: quality, waiting for tree to go green)

81303 [Framework] Support for Android Fullscreen Modes (severe: new feature, e: device-specific, platform-android, framework, engine, f: material design, a: fidelity, cla: yes, a: quality, customer: crowd, waiting for tree to go green, a: layout)

81325 Fix typo to trigger build (framework, f: material design, cla: yes)