Gray out "alt-code-while-typing" key icon while typing

java/res/anim/alt_code_key_while_typing_fadein.xml

java/res/anim/alt_code_key_while_typing_fadeout.xml

java/res/values/attrs.xml

java/res/values/config.xml

java/res/values/styles.xml

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

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

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