Making LauncherActivityInstallInfo public to prevent access modification
by proguard

Bug: 29539169
Change-Id: I2fbe7672b6456dd60393093bf4a73e7336dbaca6
diff --git a/src/com/android/launcher3/util/CachedPackageTracker.java b/src/com/android/launcher3/util/CachedPackageTracker.java
index d55d573..293714e 100644
--- a/src/com/android/launcher3/util/CachedPackageTracker.java
+++ b/src/com/android/launcher3/util/CachedPackageTracker.java
@@ -170,7 +170,7 @@
      */
     protected abstract void onLauncherPackageRemoved(String packageName, UserHandleCompat user);
 
-    protected static class LauncherActivityInstallInfo
+    public static class LauncherActivityInstallInfo
             implements Comparable<LauncherActivityInstallInfo> {
         public final LauncherActivityInfoCompat info;
         public final long installTime;