Add blob size to shared data dev options screens.

Bug: 156671006
Test: make RunSettingsRoboTests ROBOTEST_FILTER=SharedDataPreferenceControllerTest
Test: manual (visual)
Change-Id: Ia98c3d9812f6225ee834b4d1b0f12a1a73a87598

tests/robotests/src/com/android/settings/development/storage/SharedDataPreferenceControllerTest.java

@@ -113,7 +113,8 @@ public class SharedDataPreferenceControllerTest {
         accessors.add(two);
 
         final List<BlobInfo> tmp = new ArrayList<>();
-        tmp.add(new BlobInfo(10, System.currentTimeMillis(), "testing blob 1", accessors));
+        tmp.add(new BlobInfo(10, System.currentTimeMillis(), "testing blob 1", 54 * 1024 * 1024,
+                                accessors));
         return tmp;
     }
 }