Merge "Move Constants.java to the latin.common package"

...n/src/com/android/inputmethod/latin/common/Constants.java

...d/inputmethod/accessibility/KeyCodeDescriptionMapper.java

...oid/inputmethod/compat/InputMethodSubtypeCompatUtils.java

java/src/com/android/inputmethod/event/CombinerChain.java

java/src/com/android/inputmethod/event/DeadKeyCombiner.java

java/src/com/android/inputmethod/event/Event.java

...droid/inputmethod/event/HardwareKeyboardEventDecoder.java

.../src/com/android/inputmethod/event/MyanmarReordering.java

java/src/com/android/inputmethod/keyboard/Key.java

java/src/com/android/inputmethod/keyboard/Keyboard.java

.../android/inputmethod/keyboard/KeyboardActionListener.java

java/src/com/android/inputmethod/keyboard/KeyboardId.java

...c/com/android/inputmethod/keyboard/KeyboardLayoutSet.java

java/src/com/android/inputmethod/keyboard/KeyboardView.java

...rc/com/android/inputmethod/keyboard/MainKeyboardView.java

...om/android/inputmethod/keyboard/MoreKeysKeyboardView.java

.../src/com/android/inputmethod/keyboard/PointerTracker.java

java/src/com/android/inputmethod/keyboard/ProximityInfo.java

...com/android/inputmethod/keyboard/emoji/EmojiCategory.java

...android/inputmethod/keyboard/emoji/EmojiPalettesView.java