Merge "Added support for speaking keys through accessibility service."

java/res/values/keycodes.xml

java/res/values/strings.xml

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

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

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

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

...src/com/android/inputmethod/latin/AccessibilityUtils.java

java/src/com/android/inputmethod/latin/LatinIME.java