Add SeekBarPreference.getMax().

Bug: 63047816
Test: make -j
Change-Id: I416d044fa32f3aed32c1e6239baf9c57652bca2e

src/com/android/settings/widget/SeekBarPreference.java

@@ -135,6 +135,10 @@ public class SeekBarPreference extends RestrictedPreference
         }
     }
 
+    public int getMax() {
+        return mMax;
+    }
+
     public void setProgress(int progress) {
         setProgress(progress, true);
     }