Return whether the dynamic dict operation was success.

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

...android/inputmethod/latin/ExpandableBinaryDictionary.java

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

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

native/jni/src/suggest/core/dictionary/dictionary.cpp

native/jni/src/suggest/core/dictionary/dictionary.h

...est/core/policy/dictionary_structure_with_buffer_policy.h

...ary/structure/backward/v401/ver4_patricia_trie_policy.cpp

...onary/structure/backward/v401/ver4_patricia_trie_policy.h

...policyimpl/dictionary/structure/v2/patricia_trie_policy.h

...mpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp

...yimpl/dictionary/structure/v4/ver4_patricia_trie_policy.h

...m/android/inputmethod/latin/makedict/Ver4DictEncoder.java