restore Usage Statistics

initialize was not being called anywhere.

Bug: 11188914
Change-Id: I9b3ae094b2d22605c368c1ac38de80090a336894
diff --git a/src/com/android/camera/app/CameraApp.java b/src/com/android/camera/app/CameraApp.java
index 2e61fa9..834caca 100644
--- a/src/com/android/camera/app/CameraApp.java
+++ b/src/com/android/camera/app/CameraApp.java
@@ -19,12 +19,14 @@
 import android.app.Application;
 
 import com.android.camera.util.CameraUtil;
+import com.android.camera.util.UsageStatistics;
 
 public class CameraApp extends Application {
 
     @Override
     public void onCreate() {
         super.onCreate();
+        UsageStatistics.initialize(this);
         CameraUtil.initialize(this);
     }
 }