Add SharedPreferences#startCommit() method.

The interface widened.

Change-Id: I3ddf695c3d97b72eab4cfa3abe484db41d79a958
diff --git a/src/com/android/camera/ComboPreferences.java b/src/com/android/camera/ComboPreferences.java
index ab96298..68eb64d 100644
--- a/src/com/android/camera/ComboPreferences.java
+++ b/src/com/android/camera/ComboPreferences.java
@@ -142,6 +142,10 @@
             return result1 && result2;
         }
 
+        public void startCommit() {
+            commit();
+        }
+
         // Note: clear() and remove() affects both local and global preferences.
         public Editor clear() {
             mEditorGlobal.clear();