Merge "Refactor keyboard layout test more customizable"

...droid/inputmethod/keyboard/internal/KeyboardIconsSet.java

.../android/inputmethod/keyboard/layout/AlphabetShifted.java

...c/com/android/inputmethod/keyboard/layout/LayoutBase.java

...s/src/com/android/inputmethod/keyboard/layout/Qwerty.java

.../src/com/android/inputmethod/keyboard/layout/Symbols.java

...m/android/inputmethod/keyboard/layout/SymbolsShifted.java

...utmethod/keyboard/layout/expected/AbstractLayoutBase.java

...hod/keyboard/layout/expected/ExpectedKeyboardBuilder.java

...id/inputmethod/keyboard/layout/tests/LayoutTestsBase.java

...oid/inputmethod/keyboard/layout/tests/TestsEnglishUS.java