Improving photo cache

Now we have a fixed size LRU cache of compressed
images and on top of that a soft cache of
inflated bitmaps.

Change-Id: I0ea37be41d8f5c6e361bdf160e3e518b014f3615
diff --git a/src/com/android/contacts/ContactsApplication.java b/src/com/android/contacts/ContactsApplication.java
index 42ea641..c925ec0 100644
--- a/src/com/android/contacts/ContactsApplication.java
+++ b/src/com/android/contacts/ContactsApplication.java
@@ -86,6 +86,7 @@
         if (ContactPhotoManager.CONTACT_PHOTO_SERVICE.equals(name)) {
             if (mContactPhotoManager == null) {
                 mContactPhotoManager = ContactPhotoManager.createContactPhotoManager(this);
+                mContactPhotoManager.preloadPhotosInBackground();
             }
             return mContactPhotoManager;
         }