Updating IconCache to maintain a persistent of icons

> IconDB maintains a DB of icons keyed on ComponentName + User
> During loader, icons & labels are loaded first from the DB, and
if the entry doesn't exist, loaded using packageManager
> After the loader completes, IconDB updates any entry which might have
changed, while the launcher was dead.

Change-Id: I7a6021cb6d1ca1e66fa5a0bdd21e1543e0cf66fc
diff --git a/src/com/android/launcher3/AppInfo.java b/src/com/android/launcher3/AppInfo.java
index a66bac0..455c6d1 100644
--- a/src/com/android/launcher3/AppInfo.java
+++ b/src/com/android/launcher3/AppInfo.java
@@ -19,19 +19,15 @@
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
-import android.content.pm.PackageInfo;
-import android.content.pm.PackageManager.NameNotFoundException;
-import android.content.pm.ResolveInfo;
 import android.graphics.Bitmap;
 import android.util.Log;
 
 import com.android.launcher3.compat.LauncherActivityInfoCompat;
-import com.android.launcher3.compat.UserManagerCompat;
 import com.android.launcher3.compat.UserHandleCompat;
+import com.android.launcher3.compat.UserManagerCompat;
 
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.HashMap;
 
 /**
  * Represents an app in AllAppsView.
@@ -77,13 +73,13 @@
      * Must not hold the Context.
      */
     public AppInfo(Context context, LauncherActivityInfoCompat info, UserHandleCompat user,
-            IconCache iconCache, HashMap<Object, CharSequence> labelCache) {
+            IconCache iconCache) {
         this.componentName = info.getComponentName();
         this.container = ItemInfo.NO_ID;
 
         flags = initFlags(info);
         firstInstallTime = info.getFirstInstallTime();
-        iconCache.getTitleAndIcon(this, info, labelCache);
+        iconCache.getTitleAndIcon(this, info);
         intent = makeLaunchIntent(context, info, user);
         this.user = user;
     }