Kill+restart tasks before/after decoder init.

Bug 19625976.

Change-Id: I6d8b0d2b0a77ccda1bfc914501cf568b92862980

java-overridable/src/com/android/inputmethod/latin/utils/StatsUtilsManager.java

@@ -26,12 +26,17 @@ import com.android.inputmethod.latin.settings.SettingsValues;
 public class StatsUtilsManager {
 
     private static final StatsUtilsManager sInstance = new StatsUtilsManager();
+    private static StatsUtilsManager sTestInstance = null;
 
     /**
      * @return the singleton instance of {@link StatsUtilsManager}.
      */
     public static StatsUtilsManager getInstance() {
-        return sInstance;
+        return sTestInstance != null ? sTestInstance : sInstance;
+    }
+
+    public static void setTestInstance(final StatsUtilsManager testInstance) {
+        sTestInstance = testInstance;
     }
 
     public void onCreate(final Context context, final DictionaryFacilitator dictionaryFacilitator) {

java/src/com/android/inputmethod/latin/utils/ExecutorUtils.java

@@ -23,7 +23,6 @@ import com.android.inputmethod.annotations.UsedForTesting;
 import java.lang.Thread.UncaughtExceptionHandler;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
-import java.util.concurrent.ScheduledFuture;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 
@@ -74,6 +73,16 @@ public class ExecutorUtils {
         return sExecutorService;
     }
 
+    public static void killTasks() {
+        getBackgroundExecutor().shutdownNow();
+        try {
+            getBackgroundExecutor().awaitTermination(5, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+            Log.wtf(TAG, "Failed to shut down background task.");
+            throw new IllegalStateException("Failed to shut down background task.");
+        }
+    }
+
     public static Runnable chain(final Runnable... runnables) {
         return new RunnableChain(runnables);
     }