Fixing indeterminate progress bar animation state.

When showing a progress bar instance more than once
it will not animate after the first time.

Change-Id: I5104c551d561755005e533f2ab5257454567bf71
Signed-off-by: David Sobreira Marques <dpsmarques@gmail.com>

core/java/android/widget/ProgressBar.java

@@ -934,4 +934,20 @@ public class ProgressBar extends View {
         setProgress(ss.progress);
         setSecondaryProgress(ss.secondaryProgress);
     }
+
+    @Override
+    protected void onAttachedToWindow() {
+        super.onAttachedToWindow();
+        if (mIndeterminate) {
+            startAnimation();
+        }
+    }
+
+    @Override
+    protected void onDetachedFromWindow() {
+        super.onDetachedFromWindow();
+        if (mIndeterminate) {
+            stopAnimation();
+        }
+    }
 }