33474 Fixed for DropdownButton crashing when a style was used that didn’t include a fontSize (cla: yes, f: material design, framework)

33475 Move declaration of semantic handlers from detectors to recognizers (cla: yes, framework)

33477 Fix onExit calling when the mouse is removed. (cla: yes, framework)

33488 use toFixedAsString and DoubleProperty in diagnosticProperties (cla: yes, framework)

33489 Remove empty file (cla: yes, framework)

33525 Add capability to flutter test –platform=chrome (cla: yes, tool)

33526 Update Fuchsia SDK (cla: yes, tool)

33528 Build the solution on Windows (cla: yes)