This CL introduces a sequence number to avoid redundant IPCs between IMM and IMMS. The basic concept is that: 1. IMMS maintains a sequence number for #notifyUserAction. 2. IMMS increases the sequence number whenever the current IME/subtype is changed. 3. IMMS notifies the new sequence number to IMM. 4. IMM maintains the last sent sequence number and the next sequence number. IMM should call #notifyUserAction only once per particular sequence number. 5. IMMS ignores #notifyUserAction if the specified sequence number is not the expected one. BUG: 7043015 Change-Id: I19ad8542659bc092b92ee13eb9f1d68ddd4b815a
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