7953 libtxt: remove a debug log message in ComputeStrut (cla: yes)

7954 Fixed an Android keyboard entry bug that was introduced by the embedding refactor. (#28438) (cla: yes)

7960 Android Embedding PR 10: Add system channels to FlutterEngine. (cla: yes)

7964 Fix cursor jumping when typing some special characters. (cla: yes)

7967 Add api 21 check to LocalizationChannel.java (cla: yes)

7968 Switch flutter’s dart sdk to full and add dartdevc libraries (cla: yes)

7972 Android Embedding PR 11: Add FlutterEngine to FlutterFragment. (cla: yes)

7973 Suppress deprecation warning for usage of Configuration.locale (cla: yes)