Check whether the word is OOV or not for amanatto update.

Bug: 11736529
Change-Id: I27973212da7e922b2185dbb4febfb5bb4dfbdcbb

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

@@ -365,6 +365,7 @@ public final class BinaryDictionary extends Dictionary {
     }
 
     public static class LanguageModelParam {
+        public final String mTargetWord;
         public final int[] mWord0;
         public final int[] mWord1;
         // TODO: this needs to be a list of shortcuts
@@ -379,6 +380,7 @@ public final class BinaryDictionary extends Dictionary {
         // Constructor for unigram. TODO: support shortcuts
         public LanguageModelParam(final String word, final int unigramProbability,
                 final int timestamp) {
+            mTargetWord = word;
             mWord0 = null;
             mWord1 = StringUtils.toCodePointArray(word);
             mShortcutTarget = null;
@@ -394,6 +396,7 @@ public final class BinaryDictionary extends Dictionary {
         public LanguageModelParam(final String word0, final String word1,
                 final int unigramProbability, final int bigramProbability,
                 final int timestamp) {
+            mTargetWord = word1;
             mWord0 = StringUtils.toCodePointArray(word0);
             mWord1 = StringUtils.toCodePointArray(word1);
             mShortcutTarget = null;

native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.cpp

@@ -42,6 +42,7 @@ const int ForgettingCurveUtils::DISCARD_LEVEL_ZERO_ENTRY_TIME_STEP_COUNT_THRESHO
 
 const ForgettingCurveUtils::ProbabilityTable ForgettingCurveUtils::sProbabilityTable;
 
+// TODO: Revise the logic to decide the initial probability depending on the given probability.
 /* static */ const HistoricalInfo ForgettingCurveUtils::createUpdatedHistoricalInfo(
         const HistoricalInfo *const originalHistoricalInfo,
         const int newProbability, const int timestamp) {

native/jni/src/suggest/policyimpl/dictionary/utils/forgetting_curve_utils.h

@@ -26,7 +26,6 @@ namespace latinime {
 
 class DictionaryHeaderStructurePolicy;
 
-// TODO: Quit using bigram probability to indicate the delta.
 class ForgettingCurveUtils {
  public:
     static const int MAX_UNIGRAM_COUNT;

native/jni/src/suggest/policyimpl/dictionary/utils/probability_utils.h

@@ -23,6 +23,7 @@
 
 namespace latinime {
 
+// TODO: Quit using bigram probability to indicate the delta.
 class ProbabilityUtils {
  public:
     static AK_FORCE_INLINE int backoff(const int unigramProbability) {