Fix bug found in stability test.

Implement getRow for UriImage.
diff --git a/src/com/android/camera/gallery/UriImage.java b/src/com/android/camera/gallery/UriImage.java
index 0232a90..a816f3f 100644
--- a/src/com/android/camera/gallery/UriImage.java
+++ b/src/com/android/camera/gallery/UriImage.java
@@ -211,7 +211,7 @@
     }
 
     public int getRow() {
-        throw new UnsupportedOperationException();
+        return 0;
     }
 
     public boolean isReadonly() {